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Information processing apparatus, information processing method, and program storage medium

  • US 7,143,445 B1
  • Filed: 05/23/2000
  • Issued: 11/28/2006
  • Est. Priority Date: 05/31/1999
  • Status: Expired due to Term
First Claim
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1. An information processing apparatus comprising:

  • means for storing content data;

    means for setting a sequential number corresponding to the content data, the sequential number incremented by one when an operation is performed on the content data stored in the means for storing content data;

    means for calculating a hash value corresponding to the content data by performing a predetermined calculation using at least a part of the management data associated with the content data and the sequential number;

    means for comparing a previously calculated hash value included in a header of the content data with the hash value of the content data calculated by the means for calculating upon receiving a request to perform an operation on the content data; and

    means for controlling reproduction of the content data based on the result of the comparison performed by the means for comparing.

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