Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements
Patent
1999-01-14
2000-11-28
Kostak, Victor R.
Computer graphics processing and selective visual display system
Display driving control circuitry
Controlling the condition of display elements
455 42, 348 55, 348 10, H04N 710
Patent
active
061542067
ABSTRACT:
A method and apparatus for distributed conditional access (CA) control on a serial communication network. An exemplary embodiment of the present invention includes a CA subsystem over a 1394 network, the CA subsystem comprising a receiver unit for receiving a digital broadcast signal (DBS) and OOB data from an external source, where the DBS and OOB data are transmitted from the external source to the receiver unit in different broadcast frequencies. The receiver unit comprises a main tuner subunit coupled to receive the DBS, which can be encrypted with respect to a first encryption scheme. The receiver unit also comprises an OOB tuner subunit coupled to receive the OOB data for decrypting the DBS with respect to the first encryption scheme. The CA subsystem also comprises a CA control unit coupled to the receiver unit, which in turn comprises a CA subunit coupled to receive the DBS and OOB data. If the DBS is encrypted with respect to the first encryption scheme, the CA subunit generates a descrambled signal from the DBS using the OOB data, such that said descrambled signal is no longer encrypted with respect to the first encryption scheme. Other embodiments of the present invention include the above and wherein the descrambled signal is encrypted with respect to a standard 1394 copy protection scheme, but not encrypted with respect to the first encryption scheme.
REFERENCES:
patent: 5058160 (1991-10-01), Banker et al.
patent: 5784095 (1998-07-01), Robbins et al.
patent: 5990927 (1999-11-01), Hendricks et al.
DVB Conditional Access, by David J. Cutts, Electronics & Communication Engineering Journal, Feb. 1997.
Kostak Victor R.
Sony Corporation of Japan
Sony Electronics Inc.
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