Methods of scrambling and unscrambling a video signal, a...

Details Methods of scrambling and unscrambling a video signal, a... Methods of scrambling and unscrambling a video signal, a...

2003-05-14

2009-08-18

LaForgia, Christian (Department: 2439)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C380S203000

Reexamination Certificate

active

07577842

ABSTRACT:
The invention relates in particular to a method of scrambling a video signal using an encryption key for controlling access to audiovisual information. The video signal is scrambled by applying a tattooing function to the video signal by using a marking key derived from the encryption key, the tattooing function including a parameter for regulating the amplitude of tattooing so as to enable the visibility of the tattooing in the video signal to be adjusted. The invention also provides a dual unscrambling method, and a system, an encoder, a decoder, a broadcast server, and a data medium for implementing said methods.

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