Copy protection for analog video signals from computing devices

Details Copy protection for analog video signals from computing devices Copy protection for analog video signals from computing devices

2008-07-08

2008-07-08

Tran, Thai Q. (Department: 2621)

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

C386S349000, C360S060000, C380S201000, C380S203000

Reexamination Certificate

active

07398008

ABSTRACT:
A copy protection method and apparatus is provided to inhibit unauthorized viewing or copying of a video signal. A varying set of additional or invalid video pulses are generated onto a typical video signal. A pulse sequence identifier identifies the location of the invalid or additional pulses and is likewise generated onto the video signal prior to the occurrence of the identified pulses. The combined signal is received at an authorized display which then decodes or filters the additional or invalid portion of the video signal from the original signal according to a decode protocol stored in local memory. A resultant video output signal is guaranteed from only the original signal.

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