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:
Jun. 08, 2004
Filed:
Dec. 02, 1999
Kent Ridge Digital Labs, Singapore, SG;
Abstract
A method, an apparatus and a computer program product are disclosed for protecting the legitimacy of an article ( ), and in particular an electronic document, against forgery or fraud. Such articles include passports, credit cards, bank notes, lottery tickets, secure forms. The method includes the following steps: several watermarks ( ) are generated independently ( ) by different cryptographic watermarking mechanisms controlled utilising information permanently associated within the article or product ( ); and each watermark is embedded in a linked cryptographic manner ( ). Subsequently, the watermarks can be scanned and digitised ( ). The authenticity of the article ( ) can be determined by verifying the correctness of extracted watermarks and the encryption links ( ) among them. Also disclosed is a method of embedding an invisible watermark ( ) in an official seal ( ) incorporated in an electronic article or document ( ).