has clause licence software license Source code available Usage unrestricted Derivatives allowed Academic Free License version 3 Allyson Lister AFL The Academic Free License is a free software license under the definition of "free" by the GNU Project, is not copyleft, and is incompatible with the GNU GPL. http://directory.fsf.org/wiki/License:AFLv3, accessed 12 June 2013; http://www.gnu.org/licenses/license-list.html, accessed 12 June 2013 Andy Brown GNU Project Free License Type Attribution required Distribution with notices