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

Phosphorescent book

Photo-erasable data processing forms

Pigment/fluorescence threshold mixing method for printing photoc

Planar card made of a thermoplastic material having visually rec

Playing cards security system

Printed article

Printed matter

Printed matter and method for printing the same

Printed matter displaying various colors according to view...

Printed product

Prints and production method thereof

Prismatic printing

Prismatic printing