EMBEDDED OPTICAL SIGNATURES IN DOCUMENTS

摘要

A method of embedding an optical signature in a document and document produced therefrom. The optical signature is an optical pattern preferably being a series of discrete marks that can be aligned in a grid that generates a known value, and the same value can be generated from examination of a document by aligning at least an X-Y coordinate grid over the embedded optical pattern. The document can be validated, authenticated, or the determination of a valid copy of an original document with the embedded optical signature made through comparison of the known value and the value generated from the optical pattern on the document. The optical pattern can also be generated from other identification codes on the document.