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Data management module, data reproduction management device and data reproduction management system

  • US 5,737,415 A
  • Filed: 07/31/1995
  • Issued: 04/07/1998
  • Est. Priority Date: 08/10/1994
  • Status: Expired due to Term
First Claim
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1. A data management module mounted on a data reproducing device for selecting and reproducing encrypted data, comprising:

  • input means for inputting said encrypted data;

    authorization control means for authorizing decoding of said encrypted data;

    decoding means for decoding said encrypted data authorized by said authorization control means; and

    charge data storage means for storing a balance value, wherein said authorization control means reduces the balance value based upon characteristics of said encrypted data decoded by said decoding means, compares the balance value with a predetermined cutoff value, and authorizes the decoding of additional encrypted data based upon the comparison, an initial value of said balance value being resettable through commands from a source external of said data management module,output means for outputting said decoded encrypted data decoded by said decoding means.

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