System and method for protection of video signals

Details System and method for protection of video signals System and method for protection of video signals

2006-09-26

2006-09-26

Barron, Gilberto (Department: 2132)

Cryptography

Video cryptography

Copy protection or prevention

C380S224000, C380S239000, C380S210000

Reexamination Certificate

active

07113597

ABSTRACT:
A method and system are provided for protecting an analog video signal sent from a video signal source to a video display enabled to receive a protected video signal. The method includes sending a string of bit values in an encrypted format from the video display to the video signal source. The string of bit values is received in the video signal source and decrypted. The string of bit values is then divided into multi-bit segments in both the video display and the video signal source. A common multi-bit segment in the string of bit values is selected for both the video display and video signal source. A plurality of analog video channels is then sent in a switched order from the video signal source to the video display based on the common multi-bit segment. The plurality of analog video channels is finally decoded in the video display using the common multi-bit segment to decode the switched order.

REFERENCES:
patent: 6345099 (2002-02-01), Alvarez
patent: 6996236 (2006-02-01), England et al.
patent: 2002/0138749 (2002-09-01), Koguchi et al.
patent: 2003/0138102 (2003-07-01), Kohn et al.
patent: 2003/0145336 (2003-07-01), Matsuzaki et al.
patent: 2004/0218759 (2004-11-01), Yacobi et al.
patent: 2005/0207577 (2005-09-01), England et al.

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