Creative Commons works can be registered with third-party entities for copyright timestamp authenticity and non-repudiation measures for proof of copyright. Registrars of Creative Commons works include: Numly, Registered Commons and more in the future.
This page is to specify best practices for registrars to use in adopting Creative Commons content for their registries.
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Cost Length of Registration Types of Works Online Registration Serial Numbers Document Storage SHA-1 Hashing Online Verification