File license.txt of Package griffon

 https://wiki.scummvm.org/index.php?title=Griffon

[...]
The original game was written in FreeBASIC by Syn9 as part of some contest and
published with the full source code. Then it was rewritten to C and ported to
GCW0 by Dmitry Smagin. The ScummVM engine is based on the C code from Dmitry
Smagin.
[....]

More information on referred external link:

 https://github.com/dmitrysmagin/griffon_legend

[...]
Some history
============

Originally The Griffon Legend was written in FreeBASIC (http://freebasic.net/)
using SDL for graphics and FMOD for sound/music. That restricted the game to
be released for Windows only. Now The Griffon Legend is rewritten in plain C
using SDL and SDL_mixer for better portability, the source code is licensed
under GPL2 license (see COPYING). All non source code assets are licensed under
Creative Commons and are copyright of their respective authors.
[...]

==> Creative Commons license for the data files of griffon.