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Method of using plural watermarks to prevent unauthorized image copying

  • US 7,158,652 B2
  • Filed: 02/27/2001
  • Issued: 01/02/2007
  • Est. Priority Date: 02/29/2000
  • Status: Expired due to Fees
First Claim
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1. A digital content processing method comprising the steps of:

  • adding information by using a plurality of copyright protection processes on the same digital content; and

    outputting the processed digital content,wherein each of the plurality of copyright protection processes differs in difficulty of being analyzed,wherein the plurality of copyright protection processes include a confidential copyright protection process and a non-confidential copyright protection process,wherein information added by the confidential copyright protection process contains both first and second information and information added by the non-confidential copyright protection process contains the first information,wherein it can be determined that an illegal process has been performed on the digital content when the first information added by the confidential copyright protection process can be extracted from the digital content and the first information added by the non-confidential copyright protection process cannot be extracted, andwherein the second information includes information that can identify the person who performed the illegal process on the digital content.

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