By committing or contributing data/files to the Tuxemon project, or any sub- projects (the "Projects"), you agree to license your code under the GNU General Public License version 3 and any later version (the "License"), and you give the Tuxemon project coordinators the permission to re-license or dual-license it under a different license, with a minimum license being GPLv2. In particular, you guarantee that you have acquired all necessary legal rights from possible other copyright holders to license the contributions.
In any case, any contributions to the Projects must be able to be re-distributed by the maintainers or others as part of the Git repository and cloned repositories, in compiled binaries, and any other ways permitted by the License.