diff --git a/src/compat.cc b/src/compat.cc
index 1f18c8a..e065288 100644
--- a/src/compat.cc
+++ b/src/compat.cc
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2013 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2013 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/compat.h b/src/compat.h
index f1c7cd9..cf192fa 100644
--- a/src/compat.h
+++ b/src/compat.h
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2013 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2013 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/configfile.cc b/src/configfile.cc
index 7514192..0853e3a 100644
--- a/src/configfile.cc
+++ b/src/configfile.cc
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2010 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/configfile.h b/src/configfile.h
index e9ee143..fa8dc1f 100644
--- a/src/configfile.h
+++ b/src/configfile.h
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2010 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/consolestream.cc b/src/consolestream.cc
index b9bc217..65477f7 100644
--- a/src/consolestream.cc
+++ b/src/consolestream.cc
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Siddhesh Poyarekar
+ * SPDX-FileCopyrightText: 2010 Siddhesh Poyarekar
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/filestream.cc b/src/filestream.cc
index a884ff2..c87b9c1 100644
--- a/src/filestream.cc
+++ b/src/filestream.cc
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Siddhesh Poyarekar
+ * SPDX-FileCopyrightText: 2010 Siddhesh Poyarekar
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/glib-extra.c b/src/glib-extra.c
index a000eba..0acd35c 100644
--- a/src/glib-extra.c
+++ b/src/glib-extra.c
@@ -1,5 +1,6 @@
 /* GLib Extra - Tentative GLib code and GLib supplements
- * Copyright (C) 1997-2002 Tim Janik
+ * SPDX-FileCopyrightText: 1997-2002 Tim Janik
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/glib-extra.h b/src/glib-extra.h
index 3928309..41f62a6 100644
--- a/src/glib-extra.h
+++ b/src/glib-extra.h
@@ -1,5 +1,6 @@
 /* GLib Extra - Tentative GLib code and GLib supplements
- * Copyright (C) 1997-2002 Tim Janik
+ * SPDX-FileCopyrightText: 1997-2002 Tim Janik
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/gst123.cc b/src/gst123.cc
index 756c885..db6b73d 100644
--- a/src/gst123.cc
+++ b/src/gst123.cc
@@ -1,6 +1,7 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2006-2010 Stefan Westerfeld
- * Copyright (C) 2010 أحمد المحمودي (Ahmed El-Mahmoudy)
+ * SPDX-FileCopyrightText: 2006-2010 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2010,2025 أحمد المحمودي (Ahmed El-Mahmoudy)
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/gtkinterface.cc b/src/gtkinterface.cc
index 6e53a2f..88de8ac 100644
--- a/src/gtkinterface.cc
+++ b/src/gtkinterface.cc
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2010 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/gtkinterface.h b/src/gtkinterface.h
index abdafe1..0949908 100644
--- a/src/gtkinterface.h
+++ b/src/gtkinterface.h
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2010 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/httpstream.cc b/src/httpstream.cc
index 8df62d9..a6c3c8b 100644
--- a/src/httpstream.cc
+++ b/src/httpstream.cc
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Siddhesh Poyarekar
+ * SPDX-FileCopyrightText: 2010 Siddhesh Poyarekar
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/iostream.cc b/src/iostream.cc
index 3043a3f..2cdfcf8 100644
--- a/src/iostream.cc
+++ b/src/iostream.cc
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Siddhesh Poyarekar
+ * SPDX-FileCopyrightText: 2010 Siddhesh Poyarekar
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/iostream.h b/src/iostream.h
index 792c6fb..2e534c9 100644
--- a/src/iostream.h
+++ b/src/iostream.h
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Siddhesh Poyarekar
+ * SPDX-FileCopyrightText: 2010 Siddhesh Poyarekar
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/keyhandler.h b/src/keyhandler.h
index 1f01a0c..74cbfa8 100644
--- a/src/keyhandler.h
+++ b/src/keyhandler.h
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2010 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/m3uparser.cc b/src/m3uparser.cc
index 29acc6c..75c7892 100644
--- a/src/m3uparser.cc
+++ b/src/m3uparser.cc
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Siddhesh Poyarekar
+ * SPDX-FileCopyrightText: 2010 Siddhesh Poyarekar
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/m3uparser.h b/src/m3uparser.h
index 14640c4..ec93406 100644
--- a/src/m3uparser.h
+++ b/src/m3uparser.h
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Siddhesh Poyarekar
+ * SPDX-FileCopyrightText: 2010 Siddhesh Poyarekar
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/microconf.cc b/src/microconf.cc
index a1f6de5..4f695f8 100644
--- a/src/microconf.cc
+++ b/src/microconf.cc
@@ -1,5 +1,6 @@
 /* MicroConf - minimal configuration framework
- * Copyright (C) 2010 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2010 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/microconf.h b/src/microconf.h
index 5b3c249..c3b961e 100644
--- a/src/microconf.h
+++ b/src/microconf.h
@@ -1,5 +1,6 @@
 /* MicroConf - minimal configuration framework
- * Copyright (C) 2010 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2010 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/msg.cc b/src/msg.cc
index d6957d7..536702c 100644
--- a/src/msg.cc
+++ b/src/msg.cc
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2012 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2012 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/msg.h b/src/msg.h
index 44e4ba2..cb10e9a 100644
--- a/src/msg.h
+++ b/src/msg.h
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2012 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2012 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/networkstream.cc b/src/networkstream.cc
index 2c323f1..b43f584 100644
--- a/src/networkstream.cc
+++ b/src/networkstream.cc
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Siddhesh Poyarekar
+ * SPDX-FileCopyrightText: 2010 Siddhesh Poyarekar
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/options.cc b/src/options.cc
index 3be7dd0..449596b 100644
--- a/src/options.cc
+++ b/src/options.cc
@@ -1,6 +1,7 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2006-2010 Stefan Westerfeld
- * Copyright (C) 2010 أحمد المحمودي (Ahmed El-Mahmoudy)
+ * SPDX-FileCopyrightText: 2006-2010 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2010 أحمد المحمودي (Ahmed El-Mahmoudy)
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/options.h b/src/options.h
index e60b014..b78ff8b 100644
--- a/src/options.h
+++ b/src/options.h
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2010 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/playlist.cc b/src/playlist.cc
index ce50d2a..b8cded4 100644
--- a/src/playlist.cc
+++ b/src/playlist.cc
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Siddhesh Poyarekar
+ * SPDX-FileCopyrightText: 2010 Siddhesh Poyarekar
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/playlist.h b/src/playlist.h
index 9872519..6a5b360 100644
--- a/src/playlist.h
+++ b/src/playlist.h
@@ -1,9 +1,10 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2006-2010 Stefan Westerfeld
- * Copyright (C) 2010 أحمد المحمودي (Ahmed El-Mahmoudy)
+ * SPDX-FileCopyrightText: 2006-2010 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2010 أحمد المحمودي (Ahmed El-Mahmoudy)
+ * SPDX-FileCopyrightText: 2010 Siddhesh Poyarekar
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * Playlist support: Playlist base object
- * Copyright (C) 2010 Siddhesh Poyarekar
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/plsparser.cc b/src/plsparser.cc
index 7c7d139..35e0e7b 100644
--- a/src/plsparser.cc
+++ b/src/plsparser.cc
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Siddhesh Poyarekar
+ * SPDX-FileCopyrightText: 2010 Siddhesh Poyarekar
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/plsparser.h b/src/plsparser.h
index 9239bbb..6b185ee 100644
--- a/src/plsparser.h
+++ b/src/plsparser.h
@@ -1,9 +1,10 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2006-2010 Stefan Westerfeld
- * Copyright (C) 2010 أحمد المحمودي (Ahmed El-Mahmoudy)
+ * SPDX-FileCopyrightText: 2006-2010 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2010 أحمد المحمودي (Ahmed El-Mahmoudy)
+ * SPDX-FileCopyrightText: 2010 Siddhesh Poyarekar
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * Playlist support: PLS playlist parser
- * Copyright (C) 2010 Siddhesh Poyarekar
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/terminal.cc b/src/terminal.cc
index 92cc49b..8653047 100644
--- a/src/terminal.cc
+++ b/src/terminal.cc
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2010 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/terminal.h b/src/terminal.h
index ff45e3f..2d5a0e1 100644
--- a/src/terminal.h
+++ b/src/terminal.h
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2010 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/typefinder.cc b/src/typefinder.cc
index 0177ba7..0dba5d0 100644
--- a/src/typefinder.cc
+++ b/src/typefinder.cc
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2012 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2010 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/typefinder.h b/src/typefinder.h
index d1b587e..c75ec61 100644
--- a/src/typefinder.h
+++ b/src/typefinder.h
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2012 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2012 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/uri.cc b/src/uri.cc
index 68770f3..e94825e 100644
--- a/src/uri.cc
+++ b/src/uri.cc
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Siddhesh Poyarekar
+ * SPDX-FileCopyrightText: 2010 Siddhesh Poyarekar
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/uri.h b/src/uri.h
index c48fd3f..4b46040 100644
--- a/src/uri.h
+++ b/src/uri.h
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2010 Siddhesh Poyarekar
+ * SPDX-FileCopyrightText: 2010 Siddhesh Poyarekar
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/utils.cc b/src/utils.cc
index f1c405d..fd077fe 100644
--- a/src/utils.cc
+++ b/src/utils.cc
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2016 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2016 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/utils.h b/src/utils.h
index 89309a1..ae8e237 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2016 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2016 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/visualization.cc b/src/visualization.cc
index 7453102..97626f3 100644
--- a/src/visualization.cc
+++ b/src/visualization.cc
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2012 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2012 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/src/visualization.h b/src/visualization.h
index 3efe5f9..a1f4a52 100644
--- a/src/visualization.h
+++ b/src/visualization.h
@@ -1,5 +1,6 @@
 /* GST123 - GStreamer based command line media player
- * Copyright (C) 2012 Stefan Westerfeld
+ * SPDX-FileCopyrightText: 2012 Stefan Westerfeld
+ * SPDX-License-Identifier: LGPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public