AUTHENTICITY MARK, DOCUMENT CARRYING SUCH MARK, AND PROCESS AND DEVICE FOR READING AND VALIDATING SUCH MARK

摘要

Authenticity mark consisting of pattern of randomly divided granules attached to a delimited surface area of a substrate. The granules consist of retroreflective microspheres with a diameter smaller than 500 micron and that the number of microspheres is selected such that between 20% and 80% of the available surface of said delimited area is covered by said microspheres.