Copy protection for analog video signals from computing devices
First Claim
1. A method of processing a video signal from a computing device, the video signal including a first plurality of valid signal pulses, the method comprising the steps of:
- generating a first plurality of invalid signal pulses onto the video signal;
generating afirst pulse sequence identifier onto the video signal;
transmitting the video signal to a display device;
decoding the first pulse sequence identifier from the video signal to distinguish the first plurality of valid signal pulses and the first plurality of invalid signal pulses, and to determine the location of a second pulse sequence identifier embedded in the video signal; and
generating an output video signal from the video signal based on only the first plurality of valid signal pulses.
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Accused Products
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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Citations
10 Claims
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1. A method of processing a video signal from a computing device, the video signal including a first plurality of valid signal pulses, the method comprising the steps of:
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generating a first plurality of invalid signal pulses onto the video signal;
generating afirst pulse sequence identifier onto the video signal; transmitting the video signal to a display device; decoding the first pulse sequence identifier from the video signal to distinguish the first plurality of valid signal pulses and the first plurality of invalid signal pulses, and to determine the location of a second pulse sequence identifier embedded in the video signal; and generating an output video signal from the video signal based on only the first plurality of valid signal pulses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification