AN ADAPTIVE DECODING SYSTEM FOR PROCESSING ENCRYPTED AND NON-ENCRYPTED VIDEO DATA

摘要

PURPOSE: A system is provided for processing encrypted and non-encrypted video date. CONSTITUTION: An adaptive decoder(25) generates a program representative data stream, in selectable, encrypted or decrypted form. A method for adaptively processing input encrypted program data with an associated encryption code provides either an encrypted or a decrypted program output(110,115). In an encrypted mode, encrypted program data (47)and an associated encryption code is exported to an output port. In a decrypted mode, input encrypted program data is decrypted using an encryption key derived from the encryption code to provide decrypted program data. The decrypted program data is exported to the output port. Non-encrypted program data is exported to an output port(95) in a selectable non-encrypted mode