Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
January 9, 2007
0Patent Application Number
103869220
Date Filed
March 13, 2003
0Patent Primary Examiner
Patent abstract
The present application relates to a copy-protected compact disc and a method for producing the optical disc and preventing unauthorized copying. The contents of at least one of the lead-in items in the optical disc are altered so that it is no longer uniform, thereby making a copied disc effectively corrupted and unplayable.
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