Piracy source identification system for control access field of digital set-top box, has server performing control access to decoding keys to create signature, and subscriber chip board for clients arranged to calculate obtained signature

摘要

The system has a server (2) performing control access to decoding keys in a manner to create a signature, and a subscriber chip card for clients arranged for calculating the obtained signature. The server is arranged to create the signature of an encoding key by using bytes, where the emission flow data is encoded according to digital video broadcasting standard.