Copy protection method and system for digital media
First Claim
1. A copy protection method for digital media, the method comprising the steps of:
- (a) encrypting an original media data set with a symmetric algorithm corresponding to an original media key;
(b) generating an intermediate key by encrypting said original media key with a media identification; and
(c) encrypting said intermediate key with a public key of a compliant playing device, wherein said media identification and said public key are separately provided and are independent of each other.
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Abstract
A copy protection method and a copy protection system are disclosed. The system includes a private key verifier receiving a media certificate that includes a private key identification of a compliant playing device and searching for an actual private key corresponding to the private key identification, an intermediate key decryptor receiving an encrypted intermediate key and decrypting the intermediate key with the actual private key, a media key decryptor obtaining an original media key by decrypting the decrypted intermediate key with a media identification; and a media data decryptor receiving an encrypted media data set and decrypting the media data set with the original media key. The method and system of the present invention are applicable to all types of digital media data, and it makes no assumption of any specific media properties. The primary goal of the present invention is to significantly reduce the possibility of making any illegal copies on any nonstandard equipment and is to restrict the media data transfers only to authorized entities.
80 Citations
6 Claims
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1. A copy protection method for digital media, the method comprising the steps of:
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(a) encrypting an original media data set with a symmetric algorithm corresponding to an original media key;
(b) generating an intermediate key by encrypting said original media key with a media identification; and
(c) encrypting said intermediate key with a public key of a compliant playing device, wherein said media identification and said public key are separately provided and are independent of each other. - View Dependent Claims (2, 3)
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4. A copy protection system for digital media, the system comprising:
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a media data encryptor encrypting an original media data set with a symmetric algorithm corresponding to an original media key;
a media key encryptor generating an intermediate key by encrypting said original media key with a media identification; and
an intermediate key encryptor encrypting said intermediate key with a public key of a compliant playing device, wherein said media identification and said public key are separately provided and are independent of each other. - View Dependent Claims (5, 6)
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Specification