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From CC Wiki
Integrating Creative Commons License Information: One of the most useful attributes of using Creative Commons licenses is the quality metadata standards that can be used to both mark and identify CC licensed work. This can be anything from simply adding the ability for a media player to show the license information of a song to a full-fledge, RDFa using, semantic-web promoting web application for people to upload, share, and remix content.
Creative Commons is devoted to making it easy for developers to add license metadata functionality to all types of applications. Our tools are divided into two areas; Desktop and the Web.