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 ADUni Internet Speculative Fiction Database
External links Full text of the Open Content License statement, version 1.0 Sensei's Library
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