Patent ID: 7496198
Filing Date: 2009-02-24
Classification: H04J,H04L,H04N

Abstract:
1. A communications system for encoding and transmitting a partial dual-encrypted program stream, the communications system for receiving a clear program stream, the clear program stream including a plurality of programs, each program including a plurality of packets, the communications system comprising: a first encryptor for receiving the clear program stream and encrypting the plurality of programs according to a first encryption scheme; a second encryptor for receiving the clear program stream and encrypting the plurality of programs according to a second encryption scheme; a first demultiplexer for demultiplexing the first encrypted plurality of program streams to produce a plurality of first encrypted programs; a second demultiplexer for demultiplexing the second encrypted plurality of program streams to produce a plurality of second encrypted programs; a third demultiplexer for demultiplexing the clear program stream to produce a plurality of clear programs; and a plurality of identifier devices, each identifier device receiving at least one particular program from the plurality of first encrypted programs and receiving the same at least one particular program from the plurality of second encrypted programs and receiving the same at least one particular program from the plurality of clear programs, wherein the at least one particular program received by each identifier device is different in a form of encryption, each identifier device configured to: