The Free Software Foundation (FSF) is a 501(c)(3) non-profit organization founded by Richard Stallman on 4 October 1985 to support the free software movement, which promotes the universal freedom to study, distribute, create, and modify computer software, with the organizations preference for software being distributed under copyleft ("share alike") terms, such as with its own GNU General Public License. The FSF was incorporated in Massachusetts, USA, where it is also based. From its founding until the mid-1990s, FSFs funds were mostly used to employ software developers to write free software for the GNU Project. Since the mid-1990s, the FSFs employees and volunteers have mostly worked on legal and structural issues for the free software movement and the free software community. Consistent with its goals, only free software is used on the FSFs computers.