Method to identify the origin of a security module in pay-tv decoder system

A method for processing a broadcast content in a manner that allows an origin of a security module in pay-tv decoder system to be identified, the method comprising:

• receiving by the pay-tv decoder system a service comprising at least a first stream, a second encrypted stream and a control word stream, said first stream being encrypted by a first control word when received and said second stream being encrypted by a second control word when received;
• extracting, by the pay-tv decoder, entitlement messages from the control word stream, the entitlement messages containing access conditions and at least one main control word that facilitates the retrieval of the first and the second control words;
• transferring the entitlement messages extracted from the control word stream to the security module;
• checking, by the security module, the access conditions;
• if the access conditions are met, determining by the security module for each entitlement message the first and second control words from the at least one main control word in the entitlement message;
• determining an internal parameter of the security module, the internal parameter being unique per security module;
• selecting a current control word from the first or the second control word based in part on the internal parameter, corresponding to the first or the second stream;
• transmitting the current control word to the pay-tv decoder;
• selecting, by the pay-tv decoder, a current stream from the first or the second stream in accordance with the selection of the first or the second control word;
• and
• decrypting, by the pay-tv decoder. the current stream with the current control word.