UNIVERSITY OF BAYREUTH, BAYREUTH, GERMANY. It is a trademark label that is used to avoid product piracy. It consists of a periodic, three-dimensional surface structure. The individual structure is invisible to the naked eye making it unforgeable. Also, it has low production cost compared to holograms and RFID tags. In 2007, a report from the Organization for Economic Co-operation and Development stated that at least 10% of the world's global trading volume is affect .. ... READ MORE