DOMAIN DIGITAL RIGHTS MANAGEMENT SYSTEM, LICENSE SHARING METHOD FOR DOMAIN DIGITAL RIGHTS MANAGEMENT SYSTEM, AND LICENSE SERVER
First Claim
1. A domain DRM system comprising:
- at least one domain comprising at least one user module adapted for encryption or decryption using a provided encryption key and a domain manager adapted for decryption using a provided encryption key; and
a license server for creating encryption keys corresponding to the domain manager and at least one user module, respectively, and providing the domain manager and at least one user module with the created contents, respectively, so that, when at least one user module requests contents, a contents encryption key used to encrypt the contents is encrypted by using an encryption key of the user module and an encryption key of the domain manager according to a commutative encryption scheme, and one of the domain manager and the user module is provided with a shared license obtained as a result of encryption.
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Accused Products
Abstract
Disclosed is a domain DRM system, a license sharing method for the domain DRM system, and a license server. The domain DRM system includes at least one domain including at least one user module adapted for encryption or decryption using a provided encryption key and a domain manager adapted for decryption using a provided encryption key, and a license server for creating encryption keys corresponding to the domain manager and the one user module, respectively, and providing them with the created contents, respectively, so that, when at least one user module requests contents, a contents encryption key used to encrypt the contents is encrypted by using an encryption key of the user module and an encryption key of the domain manager according to a commutative encryption scheme, and one of the domain manager and the user module is provided with a shared license obtained as a result of encryption.
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Citations
30 Claims
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1. A domain DRM system comprising:
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at least one domain comprising at least one user module adapted for encryption or decryption using a provided encryption key and a domain manager adapted for decryption using a provided encryption key; and a license server for creating encryption keys corresponding to the domain manager and at least one user module, respectively, and providing the domain manager and at least one user module with the created contents, respectively, so that, when at least one user module requests contents, a contents encryption key used to encrypt the contents is encrypted by using an encryption key of the user module and an encryption key of the domain manager according to a commutative encryption scheme, and one of the domain manager and the user module is provided with a shared license obtained as a result of encryption. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for sharing a license for a domain DRM system, the method comprising the steps of:
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creating encryption keys corresponding to a domain manager and at least one user module, respectively, and providing the domain manager and at least one user module with corresponding encryption keys by a license server, respectively; receiving a request for contents from a first module of the user modules and encrypting a contents encryption key in response to the request, the contents encryption key having been used to encrypt the contents, by using the encryption keys corresponding to the first module and the domain manager, respectively, according to a commutative encryption scheme by the license server; and providing one of the domain manager and the first module with a shared license as a result of encryption by the license server. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A license server comprising:
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an encryption key creation module for creating encryption keys corresponding to a domain manager and at least one user module belonging to a domain, respectively; an encryption module for encrypting a contents encryption key used to encrypt contents requested by a first module of the user modules by using the encryption keys corresponding to the first module and the domain manager, respectively, according to a commutative encryption scheme; and a communication module for transmitting the encryption keys created by the encryption key creation module to the domain manager and at least one user module, respectively, and providing one of the domain manager and the first module with a shared license as a result of encryption by the encryption module. - View Dependent Claims (30)
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Specification