Add SPDX identifiers to most source files

--

Signed-off-by: Werner Koch <[email protected]>

75 files changed, 1171 insertions, 1125 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 435544ae..d85a85c9 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -14,7 +14,8 @@
 # Public License for more details.
 #
 # You should have received a copy of the GNU Lesser General Public
-# License along with this program; if not, see <https://www.gnu.org/licenses/>.
+# License along with this program; if not, see <https://gnu.org/licenses/>.
+# SPDX-License-Identifier: LGPL-2.1-or-later
 
 ## Process this file with automake to produce Makefile.in
 
diff --git a/src/assuan-support.c b/src/assuan-support.c
index 705088e4..419adb41 100644
--- a/src/assuan-support.c
+++ b/src/assuan-support.c
@@ -1,3 +1,24 @@
+/* assuan-support.c - Assuan wrappers
+ * Copyright (C) 2009 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+
 #if HAVE_CONFIG_H
 #include <config.h>
 #endif
@@ -291,4 +312,3 @@ struct assuan_system_hooks _gpgme_assuan_system_hooks =
     my_socket,
     my_connect
   };
-
diff --git a/src/ath.c b/src/ath.c
index 94d5eb1a..6cc84aa5 100644
--- a/src/ath.c
+++ b/src/ath.c
@@ -1,22 +1,22 @@
 /* ath.c - Thread-safeness library.
-   Copyright (C) 2002, 2003, 2004 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2002, 2003, 2004 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/b64dec.c b/src/b64dec.c
index c824786c..1b845ee4 100644
--- a/src/b64dec.c
+++ b/src/b64dec.c
@@ -15,7 +15,8 @@
  * GNU Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public License
- * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #include <config.h>
diff --git a/src/conversion.c b/src/conversion.c
index 4bfd3d3e..1d28096d 100644
--- a/src/conversion.c
+++ b/src/conversion.c
@@ -1,23 +1,23 @@
 /* conversion.c - String conversion helper functions.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2007 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2007 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/data-compat.c b/src/data-compat.c
index 1f04c462..a929f0b8 100644
--- a/src/data-compat.c
+++ b/src/data-compat.c
@@ -1,22 +1,22 @@
 /* data-compat.c - Compatibility interfaces for data objects.
-   Copyright (C) 2002, 2003, 2004, 2007 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2002, 2003, 2004, 2007 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/data-fd.c b/src/data-fd.c
index dec52af7..b8739f2c 100644
--- a/src/data-fd.c
+++ b/src/data-fd.c
@@ -1,22 +1,22 @@
 /* data-fd.c - A file descriptor based data object.
-   Copyright (C) 2002, 2004 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2002, 2004 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/data-identify.c b/src/data-identify.c
index 826c427a..eb657861 100644
--- a/src/data-identify.c
+++ b/src/data-identify.c
@@ -1,20 +1,21 @@
 /* data-identify.c - Try to identify the data
-   Copyright (C) 2013, 2016 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * Copyright (C) 2013, 2016 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #if HAVE_CONFIG_H
diff --git a/src/data-mem.c b/src/data-mem.c
index 7569f7df..2d19a99c 100644
--- a/src/data-mem.c
+++ b/src/data-mem.c
@@ -1,22 +1,22 @@
 /* data-mem.c - A memory based data object.
-   Copyright (C) 2002, 2003, 2004, 2007 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2002, 2003, 2004, 2007 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/data-stream.c b/src/data-stream.c
index f358a0e0..8961d079 100644
--- a/src/data-stream.c
+++ b/src/data-stream.c
@@ -1,22 +1,22 @@
 /* data-stream.c - A stream based data object.
-   Copyright (C) 2002, 2004 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2002, 2004 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/data-user.c b/src/data-user.c
index 816ad7db..d1d85250 100644
--- a/src/data-user.c
+++ b/src/data-user.c
@@ -1,22 +1,22 @@
 /* data-user.c - A user callback based data object.
-   Copyright (C) 2002, 2004 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2002, 2004 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/data.c b/src/data.c
index ba32477a..a786c7c7 100644
--- a/src/data.c
+++ b/src/data.c
@@ -1,22 +1,22 @@
 /* data.c - An abstraction for data objects.
-   Copyright (C) 2002, 2003, 2004, 2005, 2007 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2002, 2003, 2004, 2005, 2007 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/debug.c b/src/debug.c
index 84aa4084..364a5767 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -1,23 +1,23 @@
 /* debug.c - helpful output in desperate situations
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2009 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
-   MA 02110-1301, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2009 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/decrypt-verify.c b/src/decrypt-verify.c
index 224edc10..b9c3103a 100644
--- a/src/decrypt-verify.c
+++ b/src/decrypt-verify.c
@@ -1,23 +1,23 @@
 /* decrypt-verify.c - Decrypt and verify function.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/decrypt.c b/src/decrypt.c
index b51603a3..77c45627 100644
--- a/src/decrypt.c
+++ b/src/decrypt.c
@@ -1,23 +1,23 @@
 /* decrypt.c - Decrypt function.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2017 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2017 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/dirinfo.c b/src/dirinfo.c
index 73744124..10b7b5ee 100644
--- a/src/dirinfo.c
+++ b/src/dirinfo.c
@@ -14,7 +14,8 @@
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #if HAVE_CONFIG_H
diff --git a/src/edit.c b/src/edit.c
index 2867efb5..feb7cf66 100644
--- a/src/edit.c
+++ b/src/edit.c
@@ -1,22 +1,22 @@
 /* edit.c - Key edit function.
-   Copyright (C) 2002, 2003, 2004 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2002, 2003, 2004 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/encrypt-sign.c b/src/encrypt-sign.c
index cc34fbd5..acc1a05d 100644
--- a/src/encrypt-sign.c
+++ b/src/encrypt-sign.c
@@ -1,23 +1,23 @@
 /* encrypt-sign.c -  encrypt and verify functions
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/encrypt.c b/src/encrypt.c
index a27a53ac..b23d20d6 100644
--- a/src/encrypt.c
+++ b/src/encrypt.c
@@ -1,23 +1,23 @@
 /* encrypt.c - Encrypt function.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/engine-assuan.c b/src/engine-assuan.c
index 6e603d9d..83c0ca9f 100644
--- a/src/engine-assuan.c
+++ b/src/engine-assuan.c
@@ -14,7 +14,8 @@
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 /*
diff --git a/src/engine-g13.c b/src/engine-g13.c
index ec2f7af4..90f8e7ea 100644
--- a/src/engine-g13.c
+++ b/src/engine-g13.c
@@ -1,23 +1,23 @@
 /* engine-g13.c - G13 engine.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2009 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2009 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/engine-gpg.c b/src/engine-gpg.c
index 2785bf20..c88e970a 100644
--- a/src/engine-gpg.c
+++ b/src/engine-gpg.c
@@ -1,23 +1,24 @@
 /* engine-gpg.c - Gpg Engine.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007,
-                 2009, 2010, 2012, 2013 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, see <https://www.gnu.org/licenses/>.
-*/
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007,
+ *               2009, 2010, 2012, 2013 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/engine-gpgconf.c b/src/engine-gpgconf.c
index 33a1da01..303ba640 100644
--- a/src/engine-gpgconf.c
+++ b/src/engine-gpgconf.c
@@ -1,22 +1,23 @@
 /* engine-gpgconf.c - gpg-conf engine.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2008,
-                 2013 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2008,
+ *               2013 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #if HAVE_CONFIG_H
diff --git a/src/engine-gpgsm.c b/src/engine-gpgsm.c
index 5700990b..a13af7fb 100644
--- a/src/engine-gpgsm.c
+++ b/src/engine-gpgsm.c
@@ -1,24 +1,24 @@
 /* engine-gpgsm.c - GpgSM engine.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2009,
-                 2010 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2009,
+ *               2010 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/engine-spawn.c b/src/engine-spawn.c
index 7b7a9cdf..6f57a7d3 100644
--- a/src/engine-spawn.c
+++ b/src/engine-spawn.c
@@ -1,21 +1,22 @@
 /* engine-spawn.c - Run an arbitrary program
-   Copyright (C) 2014 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, see <https://www.gnu.org/licenses/>.
-*/
+ * Copyright (C) 2014 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/engine-uiserver.c b/src/engine-uiserver.c
index d8f4fce3..a79b3b13 100644
--- a/src/engine-uiserver.c
+++ b/src/engine-uiserver.c
@@ -1,23 +1,23 @@
 /* engine-uiserver.c - Uiserver engine.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2009 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2009 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 /* Peculiar: Use special keys from email address for recipient and
    signer (==sender).  Use no data objects with encryption for
diff --git a/src/engine.c b/src/engine.c
index b629bea7..b3df01aa 100644
--- a/src/engine.c
+++ b/src/engine.c
@@ -1,22 +1,23 @@
 /* engine.c - GPGME engine support.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2006, 2009, 2010 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, see <https://www.gnu.org/licenses/>.
-*/
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2006, 2009, 2010 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/error.c b/src/error.c
index a84b8673..8e0855f5 100644
--- a/src/error.c
+++ b/src/error.c
@@ -1,22 +1,22 @@
 /* error.c - Error handling for GPGME.
-   Copyright (C) 2003, 2004 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2003, 2004 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/export.c b/src/export.c
index f460e853..0cc1099f 100644
--- a/src/export.c
+++ b/src/export.c
@@ -1,21 +1,22 @@
 /* export.c - Export a key.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001-2004, 2010, 2014 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001-2004, 2010, 2014 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #if HAVE_CONFIG_H
diff --git a/src/genkey.c b/src/genkey.c
index e00d0475..f76b7d88 100644
--- a/src/genkey.c
+++ b/src/genkey.c
@@ -15,7 +15,8 @@
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #if HAVE_CONFIG_H
diff --git a/src/get-env.c b/src/get-env.c
index b13706f9..a4c336bc 100644
--- a/src/get-env.c
+++ b/src/get-env.c
@@ -1,22 +1,22 @@
 /* get_env.c - A getenv() replacement.
-   Copyright (C) 2003, 2004 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2003, 2004 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/getauditlog.c b/src/getauditlog.c
index d70e66fd..2d3f7f99 100644
--- a/src/getauditlog.c
+++ b/src/getauditlog.c
@@ -1,21 +1,21 @@
-
 /* getauditlog.c - Retrieve the audit log.
-   Copyright (C) 2007 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * Copyright (C) 2007 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #if HAVE_CONFIG_H
diff --git a/src/gpgconf.c b/src/gpgconf.c
index ce6ace41..4f7e3280 100644
--- a/src/gpgconf.c
+++ b/src/gpgconf.c
@@ -1,22 +1,22 @@
 /* gpgconf.c - GnuPG Made Easy.
-   Copyright (C) 2007 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2007 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/gpgme-json.c b/src/gpgme-json.c
index ba80f081..a7e3d5f2 100644
--- a/src/gpgme-json.c
+++ b/src/gpgme-json.c
@@ -14,11 +14,11 @@
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with this program; if not, see <https://www.gnu.org/licenses/>.
- * SPDX-License-Identifier: LGPL-2.1+
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
-/* This is tool implements the Native Messaging protocol of web
+/* This tool implements the Native Messaging protocol of web
  * browsers and provides the server part of it.  A Javascript based
  * client can be found in lang/javascript.
  */
diff --git a/src/gpgme-tool.c b/src/gpgme-tool.c
index 5c34b0b1..7a0bfcb3 100644
--- a/src/gpgme-tool.c
+++ b/src/gpgme-tool.c
@@ -1,21 +1,22 @@
 /* gpgme-tool.c - Assuan server exposing GnuPG Made Easy operations.
-   Copyright (C) 2009, 2010, 2012, 2013 g10 Code GmbH
-   Copyright (C) 2001, 2003, 2009, 2011 Free Software Foundation, Inc.
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * Copyright (C) 2009, 2010, 2012, 2013 g10 Code GmbH
+ * Copyright (C) 2001, 2003, 2009, 2011 Free Software Foundation, Inc.
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute this file and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
 #if HAVE_CONFIG_H
diff --git a/src/gpgme-w32spawn.c b/src/gpgme-w32spawn.c
index 868dbd57..64913b01 100644
--- a/src/gpgme-w32spawn.c
+++ b/src/gpgme-w32spawn.c
@@ -1,20 +1,21 @@
 /* gpgme-w32spawn.c - Wrapper to spawn a process under Windows.
-   Copyright (C) 2008 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * Copyright (C) 2008 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 
diff --git a/src/gpgme.c b/src/gpgme.c
index 3d72f695..4dbec0c7 100644
--- a/src/gpgme.c
+++ b/src/gpgme.c
@@ -1,22 +1,23 @@
 /* gpgme.c - GnuPG Made Easy.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2012,
-                 2014, 2015 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2012,
+ *               2014, 2015 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #if HAVE_CONFIG_H
diff --git a/src/gpgme.h.in b/src/gpgme.h.in
index 283ef188..722ce68b 100644
--- a/src/gpgme.h.in
+++ b/src/gpgme.h.in
@@ -15,8 +15,8 @@
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with this program; if not, see <https://www.gnu.org/licenses/>.
- * SPDX-License-Identifier: LGPL-2.1+
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  *
  * Generated from gpgme.h.in for @GPGME_CONFIG_HOST@.
  */
diff --git a/src/import.c b/src/import.c
index f0d9d9fa..33779e96 100644
--- a/src/import.c
+++ b/src/import.c
@@ -1,23 +1,23 @@
 /* import.c - Import a key.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/isascii.c b/src/isascii.c
index 924ced0c..867dd0ca 100644
--- a/src/isascii.c
+++ b/src/isascii.c
@@ -1,21 +1,21 @@
 /* Copyright (C) 1991,92,93,95,96,97,98,99,2001,2002,2004
-        Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, write to the Free
-   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-   02111-1307 USA.  */
+ *               Free Software Foundation, Inc.
+ * This file is part of the GNU C Library.
+ *
+ * The GNU C Library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * The GNU C Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/key.c b/src/key.c
index bb4d5fd6..e5dbdcb9 100644
--- a/src/key.c
+++ b/src/key.c
@@ -1,23 +1,23 @@
 /* key.c - Key objects.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/keylist.c b/src/keylist.c
index 6fe256ce..a0fa841b 100644
--- a/src/keylist.c
+++ b/src/keylist.c
@@ -1,22 +1,23 @@
 /* keylist.c - Listing keys.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2006, 2007,
-                 2008, 2009  g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2006, 2007,
+ *               2008, 2009  g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #if HAVE_CONFIG_H
diff --git a/src/keysign.c b/src/keysign.c
index 5e497935..5cb47881 100644
--- a/src/keysign.c
+++ b/src/keysign.c
@@ -14,7 +14,8 @@
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #if HAVE_CONFIG_H
diff --git a/src/mbox-util.c b/src/mbox-util.c
index 0dafc2a2..22816d64 100644
--- a/src/mbox-util.c
+++ b/src/mbox-util.c
@@ -14,8 +14,9 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 /* NB: This code has been taken from GnuPG.  Please keep it in sync
diff --git a/src/op-support.c b/src/op-support.c
index 9414e612..6affb5e4 100644
--- a/src/op-support.c
+++ b/src/op-support.c
@@ -1,20 +1,21 @@
 /* op-support.c - Supporting functions.
-   Copyright (C) 2002, 2003, 2004, 2007 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * Copyright (C) 2002, 2003, 2004, 2007 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #if HAVE_CONFIG_H
diff --git a/src/opassuan.c b/src/opassuan.c
index 2bbaacd8..c50ae557 100644
--- a/src/opassuan.c
+++ b/src/opassuan.c
@@ -1,20 +1,21 @@
 /* opassuan.c - Low-level Assuan operations.
-   Copyright (C) 2009 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * Copyright (C) 2009 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #if HAVE_CONFIG_H
diff --git a/src/parsetlv.c b/src/parsetlv.c
index b311a73f..69f48eb4 100644
--- a/src/parsetlv.c
+++ b/src/parsetlv.c
@@ -11,8 +11,9 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/src/passphrase.c b/src/passphrase.c
index 74d235cb..2a7daea1 100644
--- a/src/passphrase.c
+++ b/src/passphrase.c
@@ -1,23 +1,23 @@
 /* passphrase.c - Passphrase callback.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2005 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2005 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/passwd.c b/src/passwd.c
index 6c03002b..154ae287 100644
--- a/src/passwd.c
+++ b/src/passwd.c
@@ -1,20 +1,21 @@
 /* passwd.c - Passphrase changing function
-   Copyright (C) 2010 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * Copyright (C) 2010 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #if HAVE_CONFIG_H
diff --git a/src/posix-io.c b/src/posix-io.c
index 322c41a8..67c6e392 100644
--- a/src/posix-io.c
+++ b/src/posix-io.c
@@ -1,21 +1,22 @@
 /* posix-io.c - Posix I/O functions
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2004, 2005, 2007, 2010 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2004, 2005, 2007, 2010 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/src/posix-util.c b/src/posix-util.c
index 889c6aa5..d060c896 100644
--- a/src/posix-util.c
+++ b/src/posix-util.c
@@ -1,23 +1,23 @@
 /* posix-util.c - Utility functions for Posix
-   Copyright (C) 2001 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2004 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2001 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2004 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/progress.c b/src/progress.c
index 066a7f5d..e554caf1 100644
--- a/src/progress.c
+++ b/src/progress.c
@@ -1,23 +1,23 @@
 /* progress.c -  status handler for progress status
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/putc_unlocked.c b/src/putc_unlocked.c
index 6f046207..a0b90017 100644
--- a/src/putc_unlocked.c
+++ b/src/putc_unlocked.c
@@ -1,22 +1,22 @@
 /* putc_unlocked.c - Replacement for putc_unlocked.
-   Copyright (C) 2004 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2004 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/queryswdb.c b/src/queryswdb.c
index 698a419b..537de39d 100644
--- a/src/queryswdb.c
+++ b/src/queryswdb.c
@@ -14,7 +14,8 @@
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #if HAVE_CONFIG_H
diff --git a/src/setenv.c b/src/setenv.c
index d85bec9c..bfabc870 100644
--- a/src/setenv.c
+++ b/src/setenv.c
@@ -1,20 +1,20 @@
 /* Copyright (C) 1992,1995-2001,2004 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, write to the Free
-   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-   02110-1301 USA.  */
+ * This file is part of the GNU C Library.
+ *
+ * The GNU C Library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * The GNU C Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 # include <config.h>
diff --git a/src/sig-notation.c b/src/sig-notation.c
index c747ad62..bebf426e 100644
--- a/src/sig-notation.c
+++ b/src/sig-notation.c
@@ -1,22 +1,22 @@
 /* sig-notation.c - Signature notation data support.
-   Copyright (C) 2005 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2005 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/sign.c b/src/sign.c
index 73a38039..49eac44c 100644
--- a/src/sign.c
+++ b/src/sign.c
@@ -1,23 +1,23 @@
 /* sign.c - Signing function.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2007 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2007 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/signers.c b/src/signers.c
index f540d700..fe2d6786 100644
--- a/src/signers.c
+++ b/src/signers.c
@@ -1,23 +1,23 @@
 /* signers.c - Maintain signer sets.
-   Copyright (C) 2001 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2001 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/spawn.c b/src/spawn.c
index 7b3b4476..a4d5e8de 100644
--- a/src/spawn.c
+++ b/src/spawn.c
@@ -1,22 +1,22 @@
 /* spawn.c - Run an arbitrary command with callbacks.
-   Copyright (C) 2014 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2014 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/status-table.c b/src/status-table.c
index afc7eab8..eeafb896 100644
--- a/src/status-table.c
+++ b/src/status-table.c
@@ -1,23 +1,23 @@
-/* gpgme.c - GnuPG Made Easy.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2012 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+/* status-table.c - Status codes from gnupg.
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2012 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/stpcpy.c b/src/stpcpy.c
index 6e42911f..060df118 100644
--- a/src/stpcpy.c
+++ b/src/stpcpy.c
@@ -1,20 +1,20 @@
 /* Copyright (C) 1992, 1995, 1997, 2002, 2004 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, write to the Free
-   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-   02111-1307 USA.  */
+ * This file is part of the GNU C Library.
+ *
+ * The GNU C Library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * The GNU C Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #ifdef HAVE_CONFIG_H
 # include <config.h>
diff --git a/src/tofupolicy.c b/src/tofupolicy.c
index 460e3ba8..3ac9b8a6 100644
--- a/src/tofupolicy.c
+++ b/src/tofupolicy.c
@@ -14,7 +14,8 @@
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #if HAVE_CONFIG_H
diff --git a/src/trust-item.c b/src/trust-item.c
index f9378c68..8f4de73b 100644
--- a/src/trust-item.c
+++ b/src/trust-item.c
@@ -1,23 +1,23 @@
 /* trust-item.c - Trust item objects.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/trustlist.c b/src/trustlist.c
index ee09e6e0..69f565a0 100644
--- a/src/trustlist.c
+++ b/src/trustlist.c
@@ -1,23 +1,23 @@
 /* trustlist.c - Trust item listing.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/ttyname_r.c b/src/ttyname_r.c
index 7aed79e8..a497e47f 100644
--- a/src/ttyname_r.c
+++ b/src/ttyname_r.c
@@ -1,20 +1,21 @@
 /* ttyname_r.c - A ttyname_r() replacement.
-   Copyright (C) 2003, 2004, 2012 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * Copyright (C) 2003, 2004, 2012 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #if HAVE_CONFIG_H
diff --git a/src/verify.c b/src/verify.c
index bd35346f..a80563a0 100644
--- a/src/verify.c
+++ b/src/verify.c
@@ -1,23 +1,23 @@
 /* verify.c - Signature verification.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2005 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2005 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/version.c b/src/version.c
index bd1d965a..e1d8e592 100644
--- a/src/version.c
+++ b/src/version.c
@@ -1,23 +1,23 @@
 /* version.c - Version check routines.
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2008 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2008 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/vfs-create.c b/src/vfs-create.c
index a3bec197..1e23106a 100644
--- a/src/vfs-create.c
+++ b/src/vfs-create.c
@@ -1,22 +1,22 @@
 /* vfs-create.c - vfs create support in GPGME
-   Copyright (C) 2009 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2009 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/vfs-mount.c b/src/vfs-mount.c
index 68a8efe9..bb5f056c 100644
--- a/src/vfs-mount.c
+++ b/src/vfs-mount.c
@@ -1,22 +1,22 @@
 /* vfs-mount.c - vfs mount support in GPGME
-   Copyright (C) 2009 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2009 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/w32-glib-io.c b/src/w32-glib-io.c
index 967c64e8..abd8045e 100644
--- a/src/w32-glib-io.c
+++ b/src/w32-glib-io.c
@@ -1,23 +1,23 @@
 /* w32-glib-io.c - W32 Glib I/O functions
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2004, 2005 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2004, 2005 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/w32-util.c b/src/w32-util.c
index 798f42b3..7992b618 100644
--- a/src/w32-util.c
+++ b/src/w32-util.c
@@ -16,8 +16,9 @@
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with this program; if not, see <https://www.gnu.org/licenses/>.
- **/
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/wait-global.c b/src/wait-global.c
index 28f3921f..e88962e0 100644
--- a/src/wait-global.c
+++ b/src/wait-global.c
@@ -1,23 +1,23 @@
 /* wait-global.c
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2005 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2005 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/wait-private.c b/src/wait-private.c
index 12d31805..417cb2b3 100644
--- a/src/wait-private.c
+++ b/src/wait-private.c
@@ -1,23 +1,23 @@
 /* wait-private.c
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2005 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2005 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/wait-user.c b/src/wait-user.c
index c7bc80f8..2a42170c 100644
--- a/src/wait-user.c
+++ b/src/wait-user.c
@@ -1,23 +1,23 @@
 /* wait-user.c
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2005 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2005 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>
diff --git a/src/wait.c b/src/wait.c
index 20b23032..a011b123 100644
--- a/src/wait.c
+++ b/src/wait.c
@@ -1,23 +1,23 @@
 /* wait.c
-   Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007 g10 Code GmbH
-
-   This file is part of GPGME.
-
-   GPGME is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of
-   the License, or (at your option) any later version.
-
-   GPGME is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+ * Copyright (C) 2000 Werner Koch (dd9jn)
+ * Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
 
 #if HAVE_CONFIG_H
 #include <config.h>