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1. WO2002025599 - METHOD FOR PREVENTING COUNTERFEITING OR ALTERATION OF A PRINTED OR ENGRAVED SURFACE

Publication Number WO/2002/025599
Publication Date 28.03.2002
International Application No. PCT/CH2001/000560
International Filing Date 17.09.2001
Chapter 2 Demand Filed 17.04.2002
IPC
G07D 7/004 2016.01
GPHYSICS
07CHECKING-DEVICES
DHANDLING OF COINS OR OF VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
7Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
004using digital security elements, e.g. information coded on a magnetic thread or strip
G07D 7/005 2016.01
GPHYSICS
07CHECKING-DEVICES
DHANDLING OF COINS OR OF VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
7Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
005Testing security markings invisible to the naked eye, e.g. verifying thickened lines or unobtrusive markings or alterations
CPC
G07D 7/004
GPHYSICS
07CHECKING-DEVICES
DHANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
7Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
004using digital security elements, e.g. information coded on a magnetic thread or strip
G07D 7/0056
GPHYSICS
07CHECKING-DEVICES
DHANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
7Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
005Testing security markings invisible to the naked eye, e.g. verifying thickened lines or unobtrusive markings or alterations
0054involving markings the properties of which are altered from original properties
0056involving markings of altered colours
Applicants
  • ALPVISION SA [CH]/[CH] (AllExceptUS)
  • JORDAN, Frédéric [FR]/[CH] (UsOnly)
  • MEYLAN, Roland [CH]/[CH] (UsOnly)
  • KUTTER, Martin [CH]/[CH] (UsOnly)
Inventors
  • JORDAN, Frédéric
  • MEYLAN, Roland
  • KUTTER, Martin
Agents
  • GANGUILLET, Cyril
Priority Data
1832/0020.09.2000CH
Publication Language French (FR)
Filing Language French (FR)
Designated States
Title
(EN) METHOD FOR PREVENTING COUNTERFEITING OR ALTERATION OF A PRINTED OR ENGRAVED SURFACE
(FR) PROCEDE DESTINE A PREVENIR LA CONTREFAÇON OU L'ALTERATION D'UNE SURFACE IMPRIMEE OU GRAVEE
Abstract
(EN)
The invention concerns a method for preventing counterfeiting or alteration of a printed or engraved surface, characterised in that it consists in incorporating a signature in the form of a digital watermark in part of or in the entire document, and in particular using a technique of digital watermark enabling to mask invisible data by overstriking using the technique known as asymmetric amplitude modulation. Said technique can be applied to all types of printed material such as paper, packages or any other surface. Visible data can also be printed over the watermark. For example, a paper document comprising such a watermark enables to guarantee its authenticity for any copying eliminates the signature.
(FR)
l'invention décrit un procédé destiné à prévenir la contrefaçon ou l'altération d'une surface imprimée ou gravée, caractérisé par l'incorporation d'une signature sous la forme d'une filigrane numérique dans une partie ou dans l'ensemble du document, et en particulier une technique de filigrane numérique permettant de cacher des informations invisibles par surimpression en utilisant une technique dite de modulation d'amplitude asymétrique. Cette technique peut être appliquée à tout type de matériau imprimé comme du papier, des emballages ou toute autre surface. Des informations visibles peuvent comportant être imprimées par-dessus le filigrane. Par exemple, un document papier comportant ce filigrane permet de garantir son authenticité car une copie supprime la signature.
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