Method and apparatus for scrambling and/or descrambling digital video data and digital audio data using control data
First Claim
1. A copy prevention method of a digital magnetic recording/reproducing system comprising:
- an audio and video signal transmitting process of encrypting a marker formed by a control word for scrambling audio and video bit strips and copy prevention information for preventing an illegal copy by means of an encoding key, and multiplexing said marker with said audio and video bit strips scrambled by said control word, andan audio and video signal receiving/recording process of detecting said marker from said transmitted bit strips, decrypting and analyzing the detected marker by means of an encoded key to determine whether copy is permitted or not, updating said detected marker to be recorded on a video tape, and generating said control word from said marker to perform a descrambling and supply the audio and video signals to be displayed on a monitor.
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Accused Products
Abstract
A copy prevention method and apparatus of a digital magnetic recording/reproducing system performs the copy prevention function by encoding to insert a marker involving copy prevention function information and executing the function and allows a program supplier to realize a desired copy prevention function of various patterns, in which the marker formed by a control word for scrambling audio and video bit straps and copy prevention information for preventing an illegal copy is encrypted by an encoded key to be multiplexed with the audio and video bit strips scrambled by the control word. The marker transmitted is detected from the bit strips to be decrypted and analyzed by the encoded key to determine whether the copy is permitted or not, so that the detected marker is updated to be recorded on a video tape and the control word is produced from the marker to perform the descrambling to supply the result to a monitor to be displayed. Thus, the program supplier selects the copy prevention function, and a separate format converting apparatus is not required since a field defined within a GA format is utilized while an existing DVCR is not need to be changed for performing the copy prevention function as the data amount to be recorded is not increased.A method and apparatus for descrambling data are discussed. According to an embodiment, the invention provides a method of descrambling digital data using a digital data processing apparatus, the digital data processing apparatus including a descrambler, the method comprising: Initializing, by the digital data processing apparatus, the descrambler of the digital data processing apparatus based on control data to descramble a received digital data stream, the digital data stream being comprised of a plurality of packet units each including payload data, a first packet unit among the packet units further including a heading portion including the control data, wherein the descrambler is initialized based on the control data in the first packet unit for descrambling the first packet unit and one or more succeeding packet units; and descrambling, by the descrambler, the payload data in each of the packet units.
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Citations
45 Claims
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1. A copy prevention method of a digital magnetic recording/reproducing system comprising:
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an audio and video signal transmitting process of encrypting a marker formed by a control word for scrambling audio and video bit strips and copy prevention information for preventing an illegal copy by means of an encoding key, and multiplexing said marker with said audio and video bit strips scrambled by said control word, and an audio and video signal receiving/recording process of detecting said marker from said transmitted bit strips, decrypting and analyzing the detected marker by means of an encoded key to determine whether copy is permitted or not, updating said detected marker to be recorded on a video tape, and generating said control word from said marker to perform a descrambling and supply the audio and video signals to be displayed on a monitor. - 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. A copy prevention apparatus of a digital magnetic recording/reproducing system comprising:
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an encrypted marker detecting and inserting part for detecting a marker from input bit strips, and inserting an updated marker to said bit strips to output the result; a marker analyzing and processing part for decrypting and analyzing the encrypted marker from said marker detecting and inserting part by means of an encoded key, outputting a control word for descrambling said bit strips, and updating and encrypting the decrypted marker by means of said encoded key to output the result; a buffer part for buffering said control word and updated and encrypted marker from said marker analyzing and processing part, and inserting said updated and encrypted marker in said marker detecting and inserting part; and a descrambler for descrambling said bit strips provided via said marker detecting and inserting pant by means of said control word from said buffer part. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A method of descrambling digital data using a digital data processing apparatus including a descrambler, the method comprising:
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receiving, by a receiver, a digital data stream including scrambled digital audio data and scrambled digital video scrambled data formed in a plurality of 188 byte packet units; detecting, by the processing apparatus, a header portion of a first 188 byte packet unit among the plurality of 188 byte packet units; detecting, by the processing apparatus, the control data from the header portion of the first 188 byte packet unit; directly initializing, by the processing apparatus, the descrambler using the detected control data; descrambling, by the same descrambler and the same control word, the digital audio data and/or the digital video data included in the first 188 byte data packet unit; descrambling, by the same descrambler and the same control word, one or more succeeding 188 byte packet units including both the digital audio data and the digital video data included in the one or more succeeding 188 byte packet units; determining, by the processing apparatus, whether a minimum of a multiple of four 188 byte packet units have been descrambled; and re-initializing, by the processing apparatus, the descrambler based on different control data for descrambling a different set of 188 byte packet units based on the determination that the minimum of the multiple of four 188 byte packet units have been descrambled. - View Dependent Claims (40, 41)
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42. An apparatus for descrambling digital data, the apparatus comprising:
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a processor; and a memory connected to the processor and including executable instructions that when executed, cause the processor to perform; receiving a digital data stream including scrambled digital audio data and scrambled digital video data formed in a plurality of 188 byte packet units; detecting a header portion of a first 188 byte packet unit among the plurality of 188 byte packet units; detecting the control data from the header portion of the first 188 byte packet unit; directly initializing, by the digital data apparatus, the descrambler of the digital data processing apparatus based on the detected control data; descrambling, by the same descrambler and the same control word, the digital audio data and/or the digital video data included in the first 188 byte data packet unit; descrambling, by the same descrambler and the same control word, one or more succeeding packet units including both the digital audio data and the digital video data included in the one or more succeeding packet units; determining whether a minimum of a multiple of four packet units have been descrambled; and re-initializing the descrambler based on different control data for descrambling a different set of 188 byte packet units based on the determination that the minimum of the multiple of four 188 byte packet units have been descrambled. - View Dependent Claims (43, 44, 45)
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Specification