Use and Efficacy of DOVIDs and other Optical Security Devices

摘要

Diffractive optically variable image devices (DOVIDs) have become the primary overt authentication or security feature on protected documents and products, apart from the substrate itself and the printed design - which are the oldest but still effective authentication features. But their efficacy is being compromised by false expectations and counterfeits. It is therefore necessary to establish a clear statement of the role of DOVIDs and their function in the inspection and protection of suspect items, which will also apply to other optical security devices (OSDs).