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System and method for access control for portable data storage media

  • US 5,677,953 A
  • Filed: 06/07/1995
  • Issued: 10/14/1997
  • Est. Priority Date: 09/14/1993
  • Status: Expired due to Term
First Claim
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1. A system for accessing data by a user, comprising:

  • a processor for processing said data;

    a data storage unit for storing said data in a manner requiring different access code for accessing correspondingly different data stored on said storage unit by the user;

    a controller in communication with said processor for receiving a signal representative of one of said different access codes from a remote location and for sending a signal which enables access by said processor means to a selected portion of said data on said storage unit using one of said access codes;

    a remote authorization unit located at a location remote from said processor and said controller, said remote authorization unit for transmitting an access code to said controller from said remote location in response to an authorization request signal sent by the user to said remote authorization unit; and

    wherein said data storage unit stores update means cooperative with said transmitted access code for automatically generating updated access codes for access to previously unaccessible parts of said data storage unit when electronic update counter conditions are met.

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