The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 08, 2003
Filed:
Apr. 02, 1999
Joerg Schwenk, Dieburg, DE;
Johannes Ueberberg, St. Augustin, DE;
Deutsche Telekom AG, Bonn, DE;
Abstract
The present method concerns inserting manipulation-proof digital fingerprints into electronic documents making it possible to detect manipulations by purchasers or groups of purchasers. According to the present invention based on a predefined number of copies and a maximum number of copying hackers per document, a location or an area for the digital fingerprint of the customer is defined for each copy. All the locations or areas defined in the document for digital fingerprints are subject in their totality to an enclosed finite geometric ordering system, in which intersections of the digital fingerprints occur at defined locations or areas. By analyzing the intersection points not found by the hackers, the hackers involved in the manipulation can be uniquely determined. The method described is suitable, in particular, for identifying copies of documents which are subject to copyright protection.