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System and method for delivering encrypted information in a communication network using location identity and key tables

  • US 7,143,289 B2
  • Filed: 11/16/2001
  • Issued: 11/28/2006
  • Est. Priority Date: 10/30/2000
  • Status: Expired due to Term
First Claim
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1. A method for controlling access to digital information, comprising:

  • encrypting said digital information using a data encrypting key;

    modifying the data encrypting key using location identity data that defines at least a specific geographic location to produce a location-modified data encrypting key;

    encrypting said location-modified data encrypting key using a key encrypting key to produce an encrypted location-modified data encrypting key; and

    communicating said encrypted location-modified data encrypting key and said encrypted digital information to a recipient device such that said encrypted digital information can be decrypted by the recipient only at said specific geographic location.

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