Digital television conditional access methods and apparatus...

Details Digital television conditional access methods and apparatus... Digital television conditional access methods and apparatus...

2007-05-08

2007-05-08

Kelley, Christopher S (Department: 2614)

Interactive video distribution systems

Access control or blocking

C370S389000, C380S028000

Reexamination Certificate

active

09444488

ABSTRACT:
Conditional access methods and apparatus are provided for use with digital television receivers and other digital broadband receivers. The methods and apparatus are capable of handling several different digital signal transmission protocols in an automatic and flexible manner. An input unit is provided for analyzing and tagging incoming data bytes so that further processing operations are less dependent on the transmission format being received. A cipher handling unit is provided for adapting in real time the scrambling and descrambling performances to match the requirements of the transmission network and the receiving apparatus. A filtering mechanism is provided for filtering and handling multiple asynchronous data streams in a parallel manner.

REFERENCES:
patent: 5602920 (1997-02-01), Bestler et al.
patent: 5852290 (1998-12-01), Chaney
patent: 5874985 (1999-02-01), Matthews, III
patent: 6157411 (2000-12-01), Williams et al.
patent: 6735310 (2004-05-01), Hsing et al.
patent: 0 880 277 (1998-11-01), None
“Functional Model of a Condition Access System”, EBU Review Technical, (1995) Winter, No. 266, pp. 64-77.

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