RegisteredCommons is a new web-service aimed to provide a secure and trusted registry of audio, video, picture and text works. It will be launched at the 4th Wizards of OS Conference in Berlin together with Lawrence Lessig, co-founder of Creative Commons. RegisteredCommons will be using CAcert certificates for authenticating authors.
CAcert Assurance will be offered at the Wizards of OS conference in Berlin.

http://www.wizards-of-os.org/
http://registeredcommons.org/