A method for tracing traitor receivers in a broadcast encryption system. The method includes using a false key to encode plural subsets representing receivers in the system. The subsets are derived from a tree using a Subset-Cover system, and the traitor receiver is associated with one or more compromised...http://www.google.de/patents/US7010125?utm_source=gb-gplus-sharePatent US7010125 - Method for tracing traitor receivers in a broadcast encryption system
