Document security system

Document sheet with recessed cavity and window to allow...

Document structure with circuit elements

Document with a moire-generating raster structure

Document with an optical diffraction safety element

Document with an unforgeable surface

Document with anti-counterfeiting means to prevent reproducibili

Document with forgery-prevention means

Document with heat and pressure sensitive chromogentic compositi

Document with invisible encoded information and method of...

Documents containing information invisible to the naked eye

Documents having a revealable concealed identifier and the metho

Double blind study label

Double sided break open game ticket

Double-blind labels

Double-blind security features

Dual purpose lottery ticket and boarding pass

Dual use product or shipping label

Duplex carton label/packing list

Duplex carton label/packing list