In July 2009, 0 A.D. became free, open-source software (FOSS), where "free" means both gratis and, more importantly, "free" as in software and cultural freedom. (Specifically, we, the developers of 0 A.D., have made the code and data of the game available under the GPL license, version 2 or later, and released the art, sound and documentation under CC-BY-SA, version 3.0.) Briefly, this means that we allowed anyone to reuse components of 0 A.D. for any purpose, redistribute them and remix them