Copy protection for hybrid digital video tape recording and unprotected source material
DCFirst Claim
1. An apparatus for playing back material digitally recorded on a recording medium, comprising:
- a mechanism for playing the recording medium;
a digital output terminal operatively connected to the mechanism for providing a digital signal from the mechanism;
a digital to analog converter operatively connected to the mechanism for converting the digital signal to an analog signal;
an analog output terminal for providing an analog signal from the digital to analog converter;
a signal detector for detecting copy protection information present in the digital signal; and
a signal generator for generating an analog copy protection signal in response to the detected copy protection information, and modifying the analog signal with the generated signal.
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Accused Products
Abstract
A hybrid digital/analog video recorder prevents both analog and digital copying. The recorder (including a digital tape deck) inputs and outputs both analog and digital video signals. At the analog input, a detector detects conventional copy protection in the analog input video, and in response disables recording thereof. At the digital input, a first detector detects anti-copy bits present in the input material and in response prevents recording. A second bit detector detects serial copy prevention scheme bits, and in response adds an anti-copy bit to the input digital stream, preventing later copying of such material. When another bit detector detects anti-copy bits present in the playback digital data stream prior to conversion to analog, an analog copy protection signal modifies the output analog signal, inhibiting copying of the output signal. In another version, a specially adapted video recorder or playback device copy protects video source material which for technical reasons is not copy protectable. A copy protect "flag" is provided in a predetermined location in the video signal to be protected. The video recorder or playback device,, upon detection of the flag at playback, modifies the output standard (NTSC) video signal with a conventional copy protection process.
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Citations
49 Claims
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1. An apparatus for playing back material digitally recorded on a recording medium, comprising:
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a mechanism for playing the recording medium; a digital output terminal operatively connected to the mechanism for providing a digital signal from the mechanism; a digital to analog converter operatively connected to the mechanism for converting the digital signal to an analog signal; an analog output terminal for providing an analog signal from the digital to analog converter; a signal detector for detecting copy protection information present in the digital signal; and a signal generator for generating an analog copy protection signal in response to the detected copy protection information, and modifying the analog signal with the generated signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus for playing back information recorded digitally on a recording medium, the digitally recorded information including copy protection portions, comprising:
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a mechanism for playing the recording medium and providing a digital signal representing the recorded information; a digital to analog converter for converting the digital signal to an analog signal; and means for inserting a copy protection signal into the analog signal in response to detection of the copy protection portions.
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21. A method for inhibiting copying of material digitally recorded on a recording medium, the material including copy protection information, comprising the steps of:
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playing the material from the recording medium; detecting the copy protection information in the played material; converting the played material from a digital signal to an analog signal; generating an analog copy protection signal in response to the detected copy protection information; and modifying the analog signal with the generated analog copy protection signal. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A method of inhibiting copying of digital recorded material, the material including digital copy protection portions, comprising the steps of:
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providing from a recording a digital signal representing the recorded material; detecting the copy protection portions in the digital signal; converting the digital signal to an analog signal; and modifying the analog signal with an analog copy protection signal in response to the detection of the copy protection portions.
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41. A method of copy-protecting a video signal formed of a stream of digital data bits, the method using a serial copy protection bit detector, comprising:
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setting a first serial copy protection bit to a predetermined value, the first serial copy protection bit occurring at a predesignated location in the stream; determining the value of the first serial copy protection bit upon receipt of the video signal at the serial copy protection bit detector; setting a second serial copy protection bit to a predetermined value upon determination that the value of the first serial copy protection bit is the predetermined value, wherein the second serial copy protection bit is in a location in the stream associated with the first serial copy protection bit; detecting the second serial copy protection bit; and upon detection of the second serial copy protection bit, inhibiting recording of the video signal. - View Dependent Claims (42)
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43. A digital video recorder comprising:
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a digital video recording mechanism; an input terminal for receiving a digital video signal; a first signal detector for detecting copy protection information present in the digital video signal; means for inhibiting recording of the digital video signal in response to detection of the copy protection information; a second signal detector for detecting serial copy protection information present in the digital video signal; and a signal generator for generating a digital copy protection signal in response to the detected serial copy protection information and inserting the generated digital copy protection signal into the digital signal. - View Dependent Claims (44)
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45. An apparatus for playing back video material recorded on a recording medium, comprising:
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a mechanism for playing the recording medium and providing an analog video playback signal; a detector for detecting a copy protection flag in the played back signal; and a signal generator for generating an anti-copy signal in response to the detected copy protection flag and modifying the analog video playback signal with the generated signal. - View Dependent Claims (46, 47)
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48. A method of copy protecting recorded video material, comprising:
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providing a flag at a predetermined location in a recorded video signal to be copy protected; playing back the recorded video material as an analog video signal; detecting the flag in the played back analog video signal; and upon detecting the flag, modifying the played back analog video signal with a copy protection process.
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49. A method of copy protecting analog video material to be recorded comprising:
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providing a flag at a predetermined location in the analog video signal to be recorded; receiving the analog video signal; recording the analog video signal; detecting the flag in the recorded video signal upon playing back of the recorded video signal; and in response to detection of the flag, modifying the video signal with an analog copy protection process.
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Specification