Creative Commons
founded on the notion that some people may not want to exercise all of the intellectual property rights the law affords them (works are automatically copyrighted)
define a set of human and machine readable (RDF/XML) public licenses
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Attribution.
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Non-commercial.
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No Derivative Works.
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Copyleft.
define a means for describing works (Dublin Core and Creative Commons) in RDF/XML and associating licenses
e.g. cc:License, cc:license