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Metering retrieval of encrypted data stored in customer data retrieval terminal

  • US 5,010,571 A
  • Filed: 09/10/1986
  • Issued: 04/23/1991
  • Est. Priority Date: 09/10/1986
  • Status: Expired due to Term
First Claim
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1. A method of controlling and accounting for retrieval of data from a memory, comprising the steps of(a) providing a memory containing an encrypted data file from which retrieval must be authorized;

  • (b) authorizing said retrieval by providing an encryption key for enabling retrieval of said data and a credit signal for use in limiting the amount of data to be retrieved from said file;

    (c) limiting the amount of data retrieved from said file in accordance with said credit signal;

    (d) recording the amount of data retrieved from said file;

    (e) reporting the recorded amount of data retrieved from said file; and

    (f) authenticating said report.

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