Traitor Tracing and Revocation Mechanisms with Privacy-Preserving

Content distribution systems are vulnerable to the attack of rebroadcasting: pirate publishes the content or the decoding key in violation of the licensing agreement. Traitor tracing and revocation mechanisms can trace the traitors and revoke malicious users. We argue that privacy is another important feature in digital rights management technologies, and the proper balance between DRM and user privacy is an important question in its own right. Our scheme adds this important privacy-preserving feature into the existing content distribution system, and with the help of a trusted third party it can efficiently trace and revoke the pirate users while still preserve the privacy of honest users.