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Method and apparatus for controlling access to storage media

  • US 7,486,790 B1
  • Filed: 08/03/2000
  • Issued: 02/03/2009
  • Est. Priority Date: 06/30/2000
  • Status: Expired due to Fees
First Claim
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1. A data storage medium comprising:

  • a structure adapted to support data which is optically-readable by an optical reader;

    a material associated with said structure adapted to support data, said material characterized by displaying at least two different optical states to an optical reader, a first of said optical states occurring prior to exposure to an activating radiation and a second optical state after exposure to said activating radiation;

    a software instruction set comprising code preventing read of one or more portions of said structure of data unless an optical change of said material from said first optical state to said second optical state occurs on said data storage medium.

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