I am uploading a NMU to fix this. The debdiff is included.
diff -Nru gm-assistant-1.2.4/debian/changelog
gm-assistant-1.2.4/debian/changelog
--- gm-assistant-1.2.4/debian/changelog 2022-03-02 19:42:26.000000000 +0000
+++ gm-assistant-1.2.4/debian/changelog 2024-04-16 21:59:05.000000000 +0000
@@ -1,3 +1,10 @@
+gm-assistant (1.2.4-1.1) unstable; urgency=medium
+
+ * Non-maintainer upload
+ * Correct CC public domain dedication (Closes: #1069132)
+
+ -- Bastian Germann <b...@debian.org> Tue, 16 Apr 2024 21:59:05 +0000
+
gm-assistant (1.2.4-1) unstable; urgency=medium
* New upstream release
diff -Nru gm-assistant-1.2.4/debian/copyright
gm-assistant-1.2.4/debian/copyright
--- gm-assistant-1.2.4/debian/copyright 2022-03-02 19:42:26.000000000 +0000
+++ gm-assistant-1.2.4/debian/copyright 2024-04-16 21:53:53.000000000 +0000
@@ -15,13 +15,38 @@
Files: data/images/*
Copyright: None
-License: CC0-1.0
Comment: Found on http://openclipart.org
+License: CC-PDDC
+ The person or persons who have associated work with this document (the
+ "Dedicator" or "Certifier") hereby either (a) certifies that, to the best of
+ his knowledge, the work of authorship identified is in the public domain of
the
+ country from which the work is published, or (b) hereby dedicates whatever
+ copyright the dedicators holds in the work of authorship identified below (the
+ "Work") to the public domain. A certifier, moreover, dedicates any copyright
+ interest he may have in the associated work, and for these purposes, is
+ described as a "dedicator" below.
+ .
+ A certifier has taken reasonable steps to verify the copyright status of this
+ work. Certifier recognizes that his good faith efforts may not shield him from
+ liability if in fact the work certified is not in the public domain.
+ .
+ Dedicator makes this dedication for the benefit of the public at large and to
+ the detriment of the Dedicator's heirs and successors. Dedicator intends this
+ dedication to be an overt act of relinquishment in perpetuity of all present
+ and future rights under copyright law, whether vested or contingent, in the
+ Work. Dedicator understands that such relinquishment of all rights includes
the
+ relinquishment of all rights to enforce (by lawsuit or otherwise) those
+ copyrights in the Work.
+ .
+ Dedicator recognizes that, once placed in the public domain, the Work may be
+ freely reproduced, distributed, transmitted, used, modified, built upon, or
+ otherwise exploited by anyone for any purpose, commercial or non-commercial,
+ and in any way, including by methods that have not yet been invented or
+ conceived.
-Files: data/images/empty.svg
-Copyright: None
+Files: fr.free.gmassistant.metainfo.xml.in
+Copyright: Vincent Prat & Simon Nicolas
License: CC0-1.0
-Comment: Created by Vincent Prat
Files: data/images/GMA.svg
Copyright: 2011 Vincent Prat
