Method for managing copy protection information of recording medium
First Claim
1. A method for managing copy protection information of a recording medium, the method comprising:
- recording copy protection information in a first specific area of a recording medium, said copy protection information being used for decrypting data encrypted and recorded in a data area of the recording medium; and
recording a first key in a second specific area of the recording medium, said first key being used for decrypting the copy protection information, wherein a second key for decrypting the copy protection information is managed in a drive or an application for playing recording mediums.
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Abstract
A method for managing copy protection information of a recording medium is disclosed. Copy protection information for decrypting A/V data encrypted and recorded in a data area of an optical disc such as a CD, a DVD or a BD is recorded in a key locker in the optical disc. A first key value for reading the copy protection information is recorded in a specific area of the optical disc, and a second key value for reading the copy protection information is managed in an optical disc drive or in an application. To reproduce the A/V data in the optical disc, the copy protection information recorded in the key locker is read and decrypted by a combination of a hidden code (having the first key value) recorded in the optical disc and a drive or application key (having the second key value) managed in the optical disc drive or application. This significantly improves the security of the copy protection information.
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Citations
21 Claims
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1. A method for managing copy protection information of a recording medium, the method comprising:
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recording copy protection information in a first specific area of a recording medium, said copy protection information being used for decrypting data encrypted and recorded in a data area of the recording medium; and
recording a first key in a second specific area of the recording medium, said first key being used for decrypting the copy protection information, wherein a second key for decrypting the copy protection information is managed in a drive or an application for playing recording mediums. - View Dependent Claims (2, 3, 4, 5)
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6. A recording medium, comprising:
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a data area in which data encrypted using copy protection information is recorded;
a first specific area in which the copy protection information is recorded; and
a second specific area in which a first key for decrypting the copy protection information is recorded. - View Dependent Claims (7, 8, 9)
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10. A method for managing copy protection information of a recording medium, the method comprising the steps of:
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a) decrypting copy protection information, recorded in a first specific area of a recording medium, using a first key and a second key, said first key being read from a second specific area of the recording medium, said second key being managed in a drive or an application for playing the recording medium; and
b) decrypting data, encrypted and recorded in a data area of the recording medium, using the decrypted copy protection information. - View Dependent Claims (11, 12, 13, 14)
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15. An apparatus for managing copy protection information of a recording medium, the apparatus comprising:
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a second key generator for generating a second key required to decrypt copy protection information read from a first specific area of a recording medium; and
a copy protection information calculator for decrypting the copy protection information using the second key and a first key read from a second specific area of the recording medium. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification