/usr/share/kmahjongglib/backgrounds/default_old.copyright is in kdegames-mahjongg-data-kf5 4:15.12.3-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | Copyright (C) 2006 Raquel Ravanini <raquel@tabuleiro.com>
This background is free; 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.
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