Patent ID: 6408076
Filing Date: 2002-06-18
Classification: H04N

Abstract:
An apparatus for processing digital video broadcast data in the form of a data stream containing interleaved data sections of scrambled data and of unscrambled data, said apparatus comprising:a common data flow path provided for said data sections; at least one data flow path loop emanating from and looping back to said common data flow path, each of said loops containing a cipher capable of descrambling said scrambled data; a control capable of assuming a plurality of control states in order to selectively control the passage of said data sections through said common data flow path in order to descramble said scrambled data in said data flow path loops while maintaining the relative positions of said scrambled data and said unscrambled data in said data stream; and a packet identification processor capable of (i) identifying receipt of a packet of video data and indicating to said control the presence of scrambled and unscrambled data.