This document discusses digital copyright registries. It begins by explaining that Creative Commons does not want to build a centralized database and believes in a decentralized approach using the semantic web. It then outlines what defines a digital copyright registry, potential demand and supply sources, different registry approaches, and challenges. It argues registries should be interoperable, open services that understand public licenses and could evolve to address broader issues of provenance, trust and transparency on the decentralized web.