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Data management method

  • US 20030177093A1
  • Filed: 04/27/2000
  • Published: 09/18/2003
  • Est. Priority Date: 05/27/1999
  • Status: Active Grant
First Claim
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1. A data management method comprising:

  • preparing a substantive data unit by encrypting digital content that is for distribution;

    extracting a portion of the digital content as sample data, and preparing a sample data unit wherein authorization information containing information for a content key employed as an encryption key when encrypting the digital content is embedded as invisible information; and

    preparing synthesized data wherein the substantive data unit and the sample data unit are synthesized, and distributing the synthesized data.

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