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Digital rights management license identification

  • US 10,453,003 B2
  • Filed: 09/18/2008
  • Issued: 10/22/2019
  • Est. Priority Date: 09/18/2008
  • Status: Active Grant
First Claim
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1. A computer-implemented method of building a digital license for digital rights management executed on an electronic device, the method comprising:

  • assigning a decryption content key to the digital license, the electronic device requiring the decryption content key to decrypt content data encrypted by a symmetric encryption cryptographic content key;

    assigning a policy in the digital license, the policy including a first portion not affecting rights granted by the policy and a second portion defining circumstances in which the decryption content key is allowed to decrypt the content data, the second portion including indication of when the digital license expires;

    applying a deterministic sequence of instructions to the second portion of the policy to return a digital fingerprint based on the second portion of the policy but ignoring the first portion of the policy; and

    assigning the digital fingerprint to the digital license as an identifier for the digital license.

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