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 video signal pulses, the method comprising the steps of:
- generating a first plurality of invalid video signal pulses onto the video signal;
generating a first 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 video signal pulses and the first plurality of invalid video signal pulses; and
generating an output video signal from the video signal based on only the first plurality of valid video signal pulses.
2 Assignments
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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
37 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 video signal pulses, the method comprising the steps of:
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generating a first plurality of invalid video signal pulses onto the video signal;
generating a first 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 video signal pulses and the first plurality of invalid video signal pulses; and
generating an output video signal from the video signal based on only the first plurality of valid video signal pulses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of processing a video signal from a computing device to inhibit unauthorized viewing or copying of the video signal, the method comprising the steps of:
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generating a sequence signal onto the video signal indicating the validity of each pulse on the video signal;
transmitting the video signal;
decoding the sequence signal from the transmitted video signal to determine a valid pulse;
generating a video signal output from the transmitted video signal using only valid pulses. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A copy-protected video system to prevent unauthorized copying of a protected video signal transmitted from a video playing device, the video signal comprising a plurality of original video signal pulses, comprising:
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a computing device comprising;
a graphics controller to generate a first plurality of additional video signal pulses and a first pulse sequence identifier onto the video signal; and
an encoding device to encode information to identify the locations of the additional video signal pulses, the encoded information contained in the first pulse sequence identifier; and
a display device receiving the video signal from computing device, the display device comprising;
a decoding device for decoding the first pulse sequence identifier from the video signal to determine valid video signal pulses from the plurality of original video signal pulses and additional video signal pulses, the decoding device generating an output signal from the valid video signal pulses. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification