Patent ID: 7769053
Filing Date: 2010-08-03
Classification: H04L,H04N

Abstract:
1. A data multiplexing device which multiplexes and transmits transport stream packets of program data consisting of a plurality of transport stream packets forming different programs, said transport stream packets being associated with respective programs, said device comprising: multiplexing means for multiplexing the transport stream packets of said programs to produce a multiplexed stream of packets associated with said programs; a scramble key generation means for generating scramble keys, a respective scramble key corresponding to a respective program, and a scramble means for scrambling said transport stream packets of a respective program by using the scramble key generated by said scramble key generation means that corresponds to said respective program, thereby scrambling some of the transport stream packets in a program with one scramble key and scrambling other transport stream packets in the same program with a different scramble key.