Copy prevention method and apparatus for digital video system
First Claim
Patent Images
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.
0 Assignments
0 Petitions
Accused Products
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.
97 Citations
76 Claims
-
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. - View Dependent Claims (2, 3)
-
-
4. A copy prevention apparatus for a digital video system comprising:
-
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)
-
-
7. 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. - View Dependent Claims (8, 9)
-
-
10. A copy prevention apparatus for a digital video system comprising:
-
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)
-
-
13. 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 said received digital data stream based on said decrypted encryption key. - View Dependent Claims (14)
-
-
15. A copy prevention apparatus for a digital video system comprising:
-
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)
-
-
17. 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. - View Dependent Claims (18, 19)
-
-
20. 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. - View Dependent Claims (21, 22)
-
-
23. A recording medium having a data structure for controlling operation of copy prevention function in a digital data processing device, comprising:
-
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.
-
-
24. 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. - View Dependent Claims (25, 26, 27)
-
-
28. 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. - View Dependent Claims (29, 30, 31)
-
-
32. A copy protection method for a copy protection apparatus including a generating device, an encryption device and a recording device, the method comprising:
-
generating, via the generating device, copy prevention information to control a copy protection operation, the copy prevention information for indicating whether or not copying of digital data is permitted; generating, via the generating device, identification information to indicate an existence of the copy prevention information; encrypting, via the encrypting device, the digital data with key information while the copy protection information and the identification information is not encrypted, the key information being required to encrypt the digital data; and recording, via the recording device, the copy prevention information, the identification information and digital data on a digital recording medium, wherein the copy prevention information indicates at least one of “
copying of digital data is permitted” and
“
copying of digital data is not permitted”
when the identification information indicates that the copy prevention information exists, andwherein the recording step records the identification information such that the identification information is first read to indicate the existence of the copy prevention information and is not used to control directly the copy protection operation and the copy prevention information is next read to control the copy protection operation. - View Dependent Claims (33, 34, 35, 36, 37, 53, 57, 58, 59, 60)
-
-
38. A copy protection method for a copy protection apparatus including a receiving device, and a recording device, the method comprising:
-
receiving, via the receiving device, copy prevention information which indicates whether or not copying of digital content is permitted; and selectively recording, via the recording device, the digital content on a digital recording medium, based on a status of the received copy prevention information, wherein recording is not performed when the copy prevention information indicates that the copy is not permitted, and recording is performed when the copy prevention information indicates that at least one copy is permitted, wherein updated copy prevention information and identification information are further recorded on the digital recording medium when recording is performed, the identification information for indicating an existence of the copy prevention information, wherein the updated copy prevention information indicates at least one of “
copying of digital content is permitted” and
“
copying of digital content is not permitted”
when the identification information indicates that the updated copy prevention information exists,wherein the digital content is encrypted with key information while the copy prevention information and the identification information is not encrypted, and wherein the identification information is recorded such that the identification information is first read to indicate the existence of the copy prevention information and is not used to control directly the copy protection operation and the copy prevention information is next read to control the copy protection operation. - View Dependent Claims (39, 40, 41, 42, 61, 62, 63, 64)
-
-
43. A copy protection method for a copy protection apparatus including a reproducing device and a controller, the method comprising:
-
reading, via the reproducing device, control data recorded on a digital recording medium, the control data including an identifier to indicate whether or not copy prevention information exists, wherein the copy prevention information indicates whether digital content recorded on the digital recording medium is to be copied; and controlling, via the controller, a copy protection function based on the copy prevention information, wherein the copy prevention information indicates at least one of “
copying of digital content is permitted” and
“
copying of digital content is not permitted”
when the identifier indicates that the copy prevention information exists,wherein the digital content is encrypted with key information while the copy prevention information and the identifier is not encrypted, and wherein the identifier is recorded such that the identifier is first read to indicate the existence of the copy prevention information and is not used to control directly the copy protection operation and the copy prevention information is next read to control the copy protection operation. - View Dependent Claims (44, 54, 65, 66, 67, 68)
-
-
45. A recording medium to be read by a copy protection apparatus, comprising:
-
copy prevention information indicating whether digital content recorded on the recording medium is to be copied; and an identifier to identify the existence of the copy prevention information, wherein the copy prevention information indicates at least one of “
copying of digital content is permitted” and
“
copying of digital content is not permitted”
when the identifier indicates that the copy prevention information exists,wherein the digital content is encrypted with key information while the copy prevention information and the identifier is not encrypted, and wherein the identifier is recorded such that the identifier is first read to indicate the existence of the copy prevention information and is not used to control directly the copy protection operation and the copy prevention information is next read to control the copy protection operation. - View Dependent Claims (46, 47, 48, 55, 69, 70, 71, 72)
-
-
49. An apparatus for copy protection, comprising:
-
an extractor device programmed to extract copy prevention information to control a copy protection function, the copy prevention information for indicating whether user data is to be copied; and a controller programmed to record the user data on a digital recording medium based on the copy prevention information, wherein the copy prevention information is extracted when identification information indicates an existence of the copy prevention information, wherein the copy prevention information indicates at least one of “
copying of user data is permitted” and
“
copying of user data is not permitted”
when the identification information indicates that the copy prevention information exists,wherein the user data is encrypted with key information while the copy prevention information and the identification information is not encrypted, and wherein the identification information is recorded such that the identification information is first read to indicate the existence of the copy prevention information and is not used to control directly the copy protection operation and the copy prevention information is next read to control the copy protection operation. - View Dependent Claims (50, 51, 52, 56, 73, 74, 75, 76)
-
Specification