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Signal reproducing method and apparatus, signal recording method and apparatus and signal recording system

  • US 6,526,510 B1
  • Filed: 12/08/1998
  • Issued: 02/25/2003
  • Est. Priority Date: 12/10/1997
  • Status: Expired due to Term
First Claim
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1. A signal reproducing apparatus comprising:

  • receiving/reproducing means for receiving or reproducing digital data transmitted via a transmission medium or recorded on a recording medium, said digital data containing a main stream and a sub-stream, said main stream being original digital signals having copyright control information for copying limitation superimposed thereon by watermark processing and said sub-stream being generation limitation information specifying the number of times of possible copying or reproduction;

    generation limitation information superimposition means for detecting the generation limitation information and superimposing the detected generation limitation information on said original digital signals to form combined original digital signals;

    conversion means for converting the combined original digital signals into analog baseband signals; and

    outputting means for outputting the analog baseband signals.

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