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Method and system of dynamic transformation of encrypted material

  • US 5,991,402 A
  • Filed: 09/23/1997
  • Issued: 11/23/1999
  • Est. Priority Date: 09/23/1997
  • Status: Expired due to Term
First Claim
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1. A method of operating a virtual device driver or kernel mode driver to control the usage of encrypted material that has been installed on a computer comprising the steps of:

  • monitoring all requests for access to the encrypted material;

    upon receiving a request for access to the encrypted material, obtaining the encrypted material;

    determining if a license exists to use the material;

    if a license exists, decoding the encrypted material in real-time;

    monitoring how much the decoded material is used; and

    determining if the usage of the material complies with the license.

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