Patent ID: 6450536
Filing Date: 2002-09-17
Classification: G09F

Abstract:
An anti-forgery method for determining the identity of sample articles with respective protected articles, said method authenticating a given sample article as being a given protected article, said method comprising the steps of:forming a protective pattern of tiny ablations on the given protected article, said tiny ablations in said protective pattern having a substantially random distribution; detecting characteristic distribution information corresponding to a predefined characteristic of said distribution of tiny ablations formed on the given protected article, said characteristic distribution information corresponding uniquely to said characteristic distribution information detected for said predefined characteristic of said protective pattern formed on the given protected article; storing registration information identifying the given protected article, said registration including said distribution information corresponding to said distribution of said tiny ablations in said protective pattern formed on the protected article; detecting sample distribution information corresponding to a distribution of tiny ablations detected within a protective pattern on the given sample article; and comparing the distribution information detected in the protective pattern on the given sample article with the distribution information in said registration information, whereby the identity of the given sample article with the given protected article is determined.