Copy prevention method and apparatus for digital video system
AssigneeLG Electronics Inc.
InventorTae Joon Park
Life of this patent
Estimating the term…
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: stream; (b) decrypting and transmitting the bit stream to which the header area is added: 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 step (c) and optionally recording it an on a tape.
Claims32
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 digital video content included in said received digital data stream based on said decrypted encryption key;
- and
- (e) transmitting said decrypted digital data stream video content to at least one of a monitor and a digital recorder reproducing device and a recording device.
A copy prevention apparatus for a digital video system comprising:
- receiving means for receiving a a receiver to receive 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 digital video content included in said received digital data stream based on said decrypted encryption key;
- and
- a controller to control transmission of said decrypted digital data stream video content to at least one of a monitor and a digital recorder reproducing device and a recording device.
A copy prevention method for a digital video data 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;
- and
- (d) decrypting digital content included in said received digital data stream based on said decrypted encryption key.
A copy prevention apparatus for a digital video data system comprising:
- receiving means for receiving a a receiver to receive 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;
- and
- a decryption unit to decrypt said encryption key using key information and to decrypt digital content included in said received digital data stream based on said decrypted encryption key.
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 predetermined key information;
- (d) decrypting digital video content included in said received digital data stream based on said decrypted encryption key.
A copy prevention apparatus for a digital video system comprising:
- a receiving means for receiving a unit to receive 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 digital video content included in said received digital data stream based on said decrypted encryption key.
A copy prevention method for a digital data system, comprising the steps of:
- (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.
A copy prevention apparatus for a digital data system, comprising the steps of :
- 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.
A recording medium having a data structure for controlling operation of a copy prevention function in a digital data processing device, comprising:
- a digital data area for storing digital data encrypted using first key information;
- and
- a key information area for 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.
A copy prevention method for a digital data system, comprising:
- 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.
A copy prevention apparatus for a digital data system, comprising:
- 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.
Dependencies are inferred from the claim text.