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Method of encrypting information for remote access while maintaining access control

  • US 6,339,825 B2
  • Filed: 07/18/2001
  • Issued: 01/15/2002
  • Est. Priority Date: 05/28/1999
  • Status: Expired due to Term
First Claim
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1. A method of controlling access to a segment of encrypted electronic information, comprising:

  • receiving, at the user location from a key server, a copy of a decryption key for the segment, and at least one user limitation assigned to the segment and associated with the decryption key;

    accessing the segment using the copy of the decryption key at the user location for the segment and a control process, the control process responsive to a user limitation to control access to the electronic information;

    destroying the copy of the decryption key at the user location in response to said accessing;

    rendering the decrypted segment in response to said accessing; and

    destroying the decrypted segment in response to said rendering.

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