- The Free Art License as published by Copyleft Attitude; either version 1.3, or (at your option) any later version, or
- The Creative Commons Attribution-ShareAlike 4.0 International License as published by Creative Commons; either version 4.0, or (at your option) any later version, or
- The GNU Free Documentation License as published by the Free Software Foundation; either version 1.3, or (at your option) any later version; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts, or
- The GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version
|