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Cryptographically controlling access to documents

  • US 8,266,706 B2
  • Filed: 01/26/2007
  • Issued: 09/11/2012
  • Est. Priority Date: 01/26/2007
  • Status: Active Grant
First Claim
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1. A computer storage medium, not consisting of signals, having computer-executable instructions, which when executed perform actions, comprising:

  • obtaining a first document that includes a first identifier that identifies a second document;

    obtaining a first key from security information associated with the first document;

    obtaining the second document, which includes encrypted data, at a first device from a data store that is located external to the first device using the first key, the second document including a second identifier that identifies security data associated with the second document, at least some of the security data being encrypted;

    decrypting at least a portion of the security data at the first device using the first key to obtain an indication of an action that is authorized with respect to the second document, the indication including a second key that corresponds to the action; and

    using the second key at the first device to perform the action, including using the second key for decryption of the encrypted data.

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