Signal tracing system and method

Details Signal tracing system and method Signal tracing system and method

2007-06-19

2007-06-19

Barron, Gilberto (Department: 2132)

Cryptography

Video cryptography

Video electric signal modification

C380S209000, C380S226000

Reexamination Certificate

active

10469039

ABSTRACT:
A system and a method are for determining the origin of a signal received by a pay television subscriber in a given region. A system includes an encryption device located at a main operator, a transmission device adapted to transmit an encrypted video signal towards at least one local operator, and a decryption device at the local operator. The decryption device includes an identification device for replacing all or part of the decrypted video signal with an identification signal characterising the decryption device.

REFERENCES:
patent: 5444491 (1995-08-01), Lim
patent: 5600573 (1997-02-01), Hendricks et al.
patent: 5748763 (1998-05-01), Rhoads
patent: 5805204 (1998-09-01), Thomson et al.
patent: RE39166 (2006-07-01), Gammie
patent: WO9844735 (1998-10-01), None

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