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Device for copy protection

  • US 20050027996A1
  • Filed: 08/22/2002
  • Published: 02/03/2005
  • Est. Priority Date: 08/22/2001
  • Status: Abandoned Application
First Claim
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1. Device for copy protection of data media units (10) carrying digital documents, especially of optically readable data media, with means for applying a digital content (2) of the digital document onto the data media unit in a physical or logical structure associated with the data media unit and means for applying additional code (3) onto the data media unit by predetermined change of the physical structure, so that during a regulated playback and/or display process of the digital data media unit by a regulation playback and/or display unit (15) the additional code is not captured and has no influence on the originating or displayed digital content of the digital document, characterized by verification means being provided for recognition of a legally produced specimen of the data media unit, which, by bypassing possible error correction or filtering units in the playback or display unit provided for a data media unit, enable immediate reader access to the additional code and makes it possible to determine, if the additional code is present and if it corresponds to the additional code applied by the application means.

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