MAME's Source Code is now available under an OSI-compliant and FSF-approved license! As a result, a great majority of files (over 90% including core files) are available under the 3-Clause BSD License but project as a whole is distributed under the terms of the GNU General Public License, version 2 or later (GPL-2.0+), since it contains code made available under multiple GPL-compatible licenses. This license change is in present for all sources as of Git revision 35ccf865 with the release of MAME 0.172. Source files may also be licensed as specified in the file header and the license change does not apply to prior versions of MAME to this version/git revision.

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