OPTICAL SECURITY DEVICE BASED ON A SURFACE OF REVOLUTION

Enhanced late point feature differentiation

Optical security device based on a surface of revolution

Enhanced late point feature differentiation

Method for producing security elements in an image which are not visible to the human eye and cannot be copied, and printed image

Optical security device based on a surface of revolution

Optical security device based on a surface of revolution

Monochrome device fluorescent pantograph

Naphthalocyanine derivatives

Multiple payload pantographs

Secure lens layer

System and method for producing color shifting or gloss effect and recording medium with color shifting or gloss effect

System and method for producing color shifting or gloss effect and recording medium with color shifting or gloss effect

Security image printing

Barcode copy protection system

Invisible composite security element

Background pattern image combining apparatus, background pattern image combining method, and computer-readable storage medium for computer program

INK WITH COHESIVE FAILURE AND IDENTIFICATION DOCUMENT INCLUDING SAME

Methods and apparatus for watermarking digitally printed documents

Method and apparatus for secure document printing

Method of producing polymer layer with latent polarized image

SECURITY DOCUMENT HAVING INTEGRATED COPY-VOID AND VALIDATION SECURITY FEATURES

Security Document and Method for the Production Thereof

Methods and apparatus for watermarking digitally printed documents

Document with linked viewer file for correlated printing

SECURITY ENHANCED PRINT MEDIA WITH COPY PROTECTION

Solid-color embedded security feature

Document containing security images

Ink with cohesive failure and identification document including same

SECURITY DOCUMENT MANUFACTURING METHOD AND APPARATUS USING HALFTONE DOTS THAT CONTAIN MICROSCOPIC IMAGES

Covert document system

Security document having integrated copy-void and validation security features