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.
93 Citations
73 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 content protection method for a digital data system including a controller and an encryption device, the method comprising:
-
receiving first key information by the encryption device within the digital data system, the first key information for encrypting digital content, the digital content including one or more data segments, the one or more data segments including a header portion and a data portion, wherein at least the data portion is encrypted using the first key information and the header portion includes classification information to classify the data portion; encrypting, via the controller controlling the encryption device, the first key information using second key information that is different than the first key information; and transferring the encrypted first key information with the controller. - View Dependent Claims (33, 34, 35)
-
-
36. An apparatus for content protection, comprising:
-
an encryption device programmed to receive first key information, the first key information for encrypting digital data, and programmed to encrypt the first key information using second key information that is different than the first key information, wherein the digital data includes one or more data segments, the one or more data segments including a header portion and a data portion, wherein at least the data portion is encrypted using the first key information and the header portion is not encrypted and the header portion includes classification information to classify the data portion; and a controller, coupled to the encryption unit, and programmed to control the encryption operation and control a transfer of the encrypted first key information. - View Dependent Claims (37, 38, 39)
-
-
40. A content protection method within a digital data system including a controller and a generating device, the method comprising:
-
generating, via the controller controlling the generating device, protected digital content, the protected digital content including one or more data segments, the one or more data segments including a header portion and a data portion, wherein at least the data portion is protected and the header portion includes classification information to classify the protected digital content; and transmitting, via the controller, the protected digital content and first key information used to generate the protected digital content, wherein the first key information is required to process the protected digital content in a receiving part and is encrypted using second key information different than the first key information. - View Dependent Claims (41, 42, 43)
-
-
44. A content protection method for a digital data system including a controller, a recording device and an encryption device, the method comprising:
-
receiving first key information by the encryption device within the digital data system, the first key information for encrypting digital data, the digital data including a header portion and a data portion; encrypting, via the controller controlling the encryption device, the first key information using second information; encrypting, via the controller controlling the encryption device, the digital data using the first key information, wherein only the data portion is encrypted; and recording, via the controller controlling the recording device, the encrypted first key information and the encrypted digital data on a digital medium, wherein the header portion includes classification information to classify the encrypted data portion on a digital medium. - View Dependent Claims (45, 46, 47)
-
-
48. A content protection method for a digital data system including a controller, a receiving circuit and a decryptor, the method comprising:
-
(a) receiving encrypted digital content and encrypted first key information by the receiving circuit within the digital data system, the first key information being previously used for encrypting the digital content, the digital content including a header portion and a data portion, wherein only the data portion is encrypted; (b) decrypting, via the controller controlling the decryptor, the first key information using second information; and (c) decrypting, via the controller controlling the decryptor, the encrypted digital content using the decrypted first key information, wherein the header portion includes classification information to classify the digital content, and the step (a) includes classifying the digital content based on the classification information by the controller. - View Dependent Claims (49, 50)
-
-
51. A content protection method within a digital data system for content protection including a controller and a receiving circuit, the method comprising:
-
receiving protected digital content and key information which is required to process the protected digital content by the receiving circuit, wherein the protected digital content includes one or more data segments, the one or more data segments including a header portion and a data portion, wherein at least a portion of the header portion is non-protected; and processing, via the controller, the protected digital content, based on the received key information, wherein the header portion includes classification information to classify the digital content, and the receiving step includes classifying the digital content based on the classification information by the controller. - View Dependent Claims (52, 53, 54)
-
-
55. An apparatus for content protection, comprising:
-
a receiving device to receive encrypted digital content and key information, wherein the encrypted digital content includes one or more data segments, the one or more data segments including a header portion and a data portion, wherein at least a portion of the header portion is non-encrypted; a key detecting device to detect the key information; and a controller to control a decryption process of the digital content based on the detected key information, wherein the header portion includes classification information to classify the digital content, and the controller is to classify the digital content based on the classification information. - View Dependent Claims (56, 57, 58, 59)
-
-
60. An apparatus for content protection, comprising:
-
a generating device to generate protected digital content, the protected digital content including one or more data segments, the one or more data segments including a header portion and a data portion, wherein at least the data portion is protected and the header portion includes classification information to classify the protected digital content; and a controller to transmit the protected digital content and first key information used to generate the protected digital content, wherein the first key information is required to process the protected digital content in a receiving part and is encrypted using second key information different than the first key information. - View Dependent Claims (61, 62, 63)
-
-
64. An apparatus for content protection, comprising:
-
a receiving device to receive first key information, the first key information for encrypting digital data, the digital data including a header portion and a data portion; an encryption device to encrypt the first key information using second information, and encrypt the digital data using the first key information, wherein only the data portion is encrypted; a recording device to record the encrypted first key information and the encrypted digital data on a digital medium; and a controller, coupled to the encryption device and the recording device, to control the encryption operation and the recording operation, wherein the header portion includes classification information to classify the encrypted data portion, and wherein the controller is to classify the encrypted data portion based on the classification information. - View Dependent Claims (65, 66, 67)
-
-
68. An apparatus for content protection, comprising:
-
a receiving device to receive encrypted digital content and encrypted first key information, the first key information being previously used for encrypting the digital content, the digital content including a header portion and a data portion, wherein only the data portion is encrypted; a decryption device to decrypt the first key information using second information and decrypt the encrypted digital content using the decrypted first key information; and a controller, coupled to the receiving unit and the decryption unit, to control the decryption operation, wherein the header portion includes classification information to classify the digital content, and wherein the controller is to classify the digital content based on the classification information received from the receiving device. - View Dependent Claims (69, 70)
-
-
71. An apparatus for content protection, comprising:
-
a receiving device to receive protected digital content and key information required to process the protected digital content, wherein the protected digital content includes one or more data segments, the one or more data segments including a header portion and a data portion, wherein at least the header portion is non-protected; a processor to process the protected digital content, using the received key information; and a controller, coupled to the receiving device and the processor, to control the processing of the protected digital content, wherein the header portion includes classification information to classify the digital content, and wherein the controller is to classify the digital content based on the classification information received from the receiving unit. - View Dependent Claims (72, 73)
-
Specification