METHOD OF PARTIALLY SCRAMBLING A DATA STREAM

A METHOD OF PARTIALLY SCRAMBLING A DATA STREAM (6) INCLUDING TRANSPORT STREAM PACKETS (7), EACH TRANSPORT STREAM PACKETS (7) HAVING A HEADER (8) AND A PAYLOAD (9), WHEREIN A SEQUENCE OF TRANSPORT STREAM PACKETS (7) HAS PAYLOAD CARRYING ENCODED DATA ELEMENTS,ARRANGED IN UNIT (15),INCLUDES:SELECTING T...

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Hauptverfasser:	HOOGENBOOM, RONALDUS, PETRUS, JOHANNES, STOCKHAMMER, THOMAS, FRANZ, VAN WIJK, ROELOF, PALMER, JAMES, STEWART, CROSBIE, DEKKER, GERARD, JOHAN, SIEDLE, DAVID, NEIL, WAJS, ANDREW AUGUSTINE
Format:	Patent
Sprache:	eng
Schlagworte:	ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY PICTORIAL COMMUNICATION, e.g. TELEVISION
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Zusammenfassung:	A METHOD OF PARTIALLY SCRAMBLING A DATA STREAM (6) INCLUDING TRANSPORT STREAM PACKETS (7), EACH TRANSPORT STREAM PACKETS (7) HAVING A HEADER (8) AND A PAYLOAD (9), WHEREIN A SEQUENCE OF TRANSPORT STREAM PACKETS (7) HAS PAYLOAD CARRYING ENCODED DATA ELEMENTS,ARRANGED IN UNIT (15),INCLUDES:SELECTING TRANSORT STREAM PACKETS (7) FORMING A SUB- SEQUENCE OF THE SEQUENCE, AND SCRAMBLING AT LEAST PART OF THE PAYLOADS (9) OF EACH TRANSPORT STREAM PACKETS (7) IN THE SUB- SEQUENCE.THE METHOD FURTHER INCLUDES MONITORING THE PAYLOADS (9) OF AT LEAST SOME OF THE TRANSPORT STREAM PACKETS (7) IN THE SEQUENCE FOR THE PRESENCE OF DATA (22) INDICATING A BOUNDARY BETWEEN TWO SEBSEQUENCE UNITS (15),AND, FOR SELECTED UNITS (15),INCLUDING AT LEAST ONE OF THE TRANSPORT STREAM PACKETS (7) CARRYING DATA FORMING PART OF THE SELECTED UNIT (15) IN THE SUN SEQUENCE.