apparemment il ne s’appuie pas exactement sur une licence GPL, tu peux trouver le détail dans les archives téléchargeables dont voici le contenu :
Copyright (C) 2007-2008 Magnus Auvinen
This software is provided ’as-is’, without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions :
1. The origin of this software must not be misrepresented ; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
4. Neither this software nor any of its individual components, in original
or modified versions, may be sold by itself.
IMPORTANT NOTE ! The source under src/engine/external are stripped
libraries with their own licenses. Mostly BSD or zlib/libpng license but
check the individual libraries.
With that being said, contact us if there is anything you want to do
that the license does not premit.
On cite l’auteur, on ne se proclame pas l’auteur, si on l’utilise dans un autre projet un remerciement est apprécié
