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DOMAIN DIGITAL RIGHTS MANAGEMENT SYSTEM, LICENSE SHARING METHOD FOR DOMAIN DIGITAL RIGHTS MANAGEMENT SYSTEM, AND LICENSE SERVER

  • US 20090208016A1
  • Filed: 02/18/2008
  • Published: 08/20/2009
  • Est. Priority Date: 02/18/2008
  • Status: Active Grant
First Claim
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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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