Object of value comprising a moiré pattern
Object with an optical effect
One-piece label with integral tear strip
Optical device
Optical discs, producing methods and production apparatus of...
Optically decodable security document
Optically diffracting security element
Optically variable and machine-readable device for use on securi
Optically-based methods and apparatus for performing...
Optically-readable cards
Owner identification for eyewear