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Open Content License

The Open Content License (OPL) is a license designed for distribution of open content material. This license is not compatible with the GFDL in that it does not allow the OPL licensed material, or derivation of such material to be sold; and restricts further versions to be licensed as OPL as well.

Projects using the OPL

MusicBrainz
HammondWiki
Sensei's Library (http://senseis.xmp.net)

External links

Full text of the Open Content License statement, version 1.0 (http://opencontent.org/opl.shtml)

All Wikipedia text is available under the terms of the GNU Free Documentation License

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