diff --git a/lib/logitech_receiver/exceptions.py b/lib/logitech_receiver/exceptions.py
index 77e3bc53..27989aa1 100644
--- a/lib/logitech_receiver/exceptions.py
+++ b/lib/logitech_receiver/exceptions.py
@@ -1,3 +1,20 @@
+## Copyright (C) 2012-2013  Daniel Pavel
+## Copyright (C) 2014-2024  Solaar Contributors https://pwr-solaar.github.io/Solaar/
+##
+## This program 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 2 of the License, or
+## (at your option) any later version.
+##
+## This program 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 General Public License for more details.
+##
+## You should have received a copy of the GNU 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.
+
 from .common import KwException as _KwException
 
 #
diff --git a/lib/logitech_receiver/hidpp10_constants.py b/lib/logitech_receiver/hidpp10_constants.py
index 46950634..c81594c8 100644
--- a/lib/logitech_receiver/hidpp10_constants.py
+++ b/lib/logitech_receiver/hidpp10_constants.py
@@ -1,3 +1,20 @@
+## Copyright (C) 2012-2013  Daniel Pavel
+## Copyright (C) 2014-2024  Solaar Contributors https://pwr-solaar.github.io/Solaar/
+##
+## This program 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 2 of the License, or
+## (at your option) any later version.
+##
+## This program 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 General Public License for more details.
+##
+## You should have received a copy of the GNU 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.
+
 from .common import NamedInts
 
 #
diff --git a/lib/logitech_receiver/hidpp20_constants.py b/lib/logitech_receiver/hidpp20_constants.py
index 64ebb259..d5f314d4 100644
--- a/lib/logitech_receiver/hidpp20_constants.py
+++ b/lib/logitech_receiver/hidpp20_constants.py
@@ -1,3 +1,20 @@
+## Copyright (C) 2012-2013  Daniel Pavel
+## Copyright (C) 2014-2024  Solaar Contributors https://pwr-solaar.github.io/Solaar/
+##
+## This program 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 2 of the License, or
+## (at your option) any later version.
+##
+## This program 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 General Public License for more details.
+##
+## You should have received a copy of the GNU 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.
+
 from .common import NamedInts
 
 # <FeaturesSupported.xml sed '/LD_FID_/{s/.*LD_FID_/\t/;s/"[ \t]*Id="/=/;s/" \/>/,/p}' | sort -t= -k2