Data nullification device for nullifying digital content recorded on a recording medium, after the digital content has been reproduced, a predetermined time period has passed since the recording of the digital content, or the digital content has been moved to another recording medium

  • US 7,493,662 B2
  • Filed: 02/06/2002
  • Issued: 02/17/2009
  • Est. Priority Date: 02/15/2001
  • Status: Active Grant
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