Copy prevention method and apparatus for digital video system
First Claim
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1. A copy prevention method for a digital video system comprising the steps of:
- (a) receiving a digital data stream reproduced from a digital medium;
(b) detecting an encryption key, which is a portion of said received digital data stream;
(c) decrypting said encryption key using key information;
(d) decrypting said received digital data stream based on said decrypted encryption key; and
(e) transmitting said decrypted digital data stream to at least one of a monitor and a digital recorder.
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Abstract
A copy prevention method and apparatus for a digital video system is disclosed including the steps of: (a) adding a header area of a header start code and key field to a reproduced bit stream: (b) decrypting and transmitting the bit stream to which the header area is added: (c) detecting a key field of the decrypted and transmitted bit stream and detecting copy prevention information; and (d) encrypting the bit stream according to information detected from stop (c) and recording it an tape.
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Citations
31 Claims
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1. A copy prevention method for a digital video system comprising the steps of:
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(a) receiving a digital data stream reproduced from a digital medium;
(b) detecting an encryption key, which is a portion of said received digital data stream;
(c) decrypting said encryption key using key information;
(d) decrypting said received digital data stream based on said decrypted encryption key; and
(e) transmitting said decrypted digital data stream to at least one of a monitor and a digital recorder. - View Dependent Claims (2, 3)
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4. A copy prevention apparatus for a digital video system comprising:
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receiving means for receiving a digital data stream reproduced from a digital medium;
a key detector to detect an encryption key, which is a portion of said received digital data stream;
a decryption unit to decrypt said encryption key using key information and to decrypt said received digital data stream based on said decrypted encryption key; and
a controller to control transmission of said decrypted digital data stream to at least one of a monitor and a digital recorder. - View Dependent Claims (5, 6)
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7. A copy prevention method for a digital video system comprising the steps of:
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(a) receiving a digital data stream reproduced from a digital medium;
(b) detecting an encryption key, which is a portion of said received digital data stream;
(c) decrypting said encryption key using key information;
(d) decrypting said received digital data stream based on said decrypted encryption key. - View Dependent Claims (8, 9)
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10. A copy prevention apparatus for a digital video system comprising:
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receiving means for receiving a digital data stream reproduced from a digital medium;
a key detector to detect an encryption key, which is a portion of said received digital data stream;
a decryption unit to decrypt said encryption key using key information and to decrypt said received digital data stream based on said decrypted encryption key. - View Dependent Claims (11, 12)
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13. A copy prevention method for a digital video system comprising the steps of:
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(a) receiving a digital data stream reproduced from a digital medium;
(b) detecting an encryption key, which is a portion of said received digital data stream;
(c) decrypting said encryption key using predetermined key information;
(d) decrypting said received digital data stream based on said decrypted encryption key. - View Dependent Claims (14)
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15. A copy prevention apparatus for a digital video system comprising:
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receiving means for receiving a digital data stream reproduced from a digital medium;
a key detector to detect an encryption key, which is a portion of said received digital data stream;
a decryption unit to decrypt said encryption key using predetermined key information and to decrypt said received digital data stream based on said decrypted encryption key. - View Dependent Claims (16)
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17. A copy prevention method for a digital data system, comprising the steps of:
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(a) receiving first key information;
(b) encrypting second key information using said first key information;
(c) encrypting digital data streams using said second key information; and
(d) recording at least said encrypted second key information and said encrypted digital data streams on a digital medium. - View Dependent Claims (18, 19)
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20. A copy prevention apparatus for a digital data system, comprising the steps of:
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an encryption unit receiving first key information, encrypting second key information using said first key information, and encrypting digital data streams using said second key information; and
a controller controlling recording of at least said encrypted second key information and said encrypted digital data streams on a digital medium. - View Dependent Claims (21, 22)
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23. A recording medium having a data structure for controlling operation of copy prevention function in a digital data processing device, comprising:
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a digital data area storing digital data encrypted using first key information; and
a key information area storing said first key information encrypted using second key information, said first key information operatively controlling the decryption of said encrypted digital data in a digital data process device.
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24. A copy prevention method for a digital data system, comprising:
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receiving first key information, said first key information for encrypting digital data;
encrypting said first key information using second information; and
transferring said encrypted first key information. - View Dependent Claims (25, 26, 27)
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28. A copy prevention apparatus for a digital data system, comprising:
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an encryption unit receiving first key information, said first key information for encrypting digital data, and encrypting said first key information using second key information; and
a controller controlling a transfer of said encrypted first key information. - View Dependent Claims (29, 30, 31)
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Specification