In RegisteredCommons.org we just had mapped some standard licenses with their links to the license text and one generic "full copyright" (pointing to a Wikipedia article, which is really not a perfect source for deciding on the license). How could we do it better?
The project DALICC allows to define a license in a granular manner and an RDF metadata can be exported. See their license composer https://www.dalicc.net/license-composer and their API https://api.dalicc.net/docs - we have contacted the head of the DALICC team, which is also just running a netidee project in the same period but could not make it for a meeting yet.
Creative Commons metadata is described by the Creative Commons Rights Expression Language (CC REL), see their WIKI https://wiki.creativecommons.org/wiki/Metadata .