Patent ID: 8548167

Claim:
A system for providing access to scrambled content comprised within a broadcast signal, the system comprising: at least two receivers for receiving the broadcast signal, the broadcast signal comprising a plurality of streams, each receiver including a security module and, a first decryption module to decrypt a first stream from the plurality of streams using a pseudo-asymmetric decryption key to produce an output, the pseudo-asymmetric decryption key being stored in the security module, said first stream being common to all said receivers and being encrypted under a pseudo-asymmetric encryption key, and a second decryption module to decrypt a second stream from the plurality of streams using the output of the first decryption module, said second stream being common to all said receivers and being encrypted under a symmetric encryption key, wherein said pseudo-asymmetric decryption key is different for each of said security modules, each different pseudo-asymmetric decryption key corresponding to the pseudo-asymmetric encryption key, the output of each of said first decryption modules being identical for all said receivers, the system thereby providing traceability of at least one of the receivers.