Patent ID: 8879893
Filing Date: 2014-11-04
Classification: H04H,H04N

Abstract:
1. Scrambling method for an over-scrambling of a MPEG2 stream at least partially scrambled, the stream being structured in packets, a packet header comprising a packet identifier (PID) field defining the service to which the packet is affected, a transport scrambling control (TSC) field, the TSC field having bits being relative to the scrambling of the packet, a continuity counter field, comprising the following steps: reading of an original PID and TSC bits in the PID and TSC fields of a packet header of said stream, writing of a temporary PID in a PID field in place of the original PID, as a function of the original PID value and TSC bits according to a correspondence table of an original PID and TSC bits with the temporary PIDs, and overscrambling of the stream with modified fields.