Security device
Security device based on customized microprism film
Security device using parallax movement to view front and...
Security device with metameric features using diffractive...
Security document with an optical security area
Security element
Security hologram with covert messaging
Security system, particularly for valuable documents
Security system, particularly for valuable documents
Semi-transparent reflective layer for a phase hologram
Semi-transparent reflective layer for a phase hologram
System and method for encoding and decoding an image or...
Tamper resisting holographic security seal
Technique of forming a separate information bearing printed patt
Transparent card with hologram, and apparatus for...
Two-dimensional/three dimensional graphic material and method of
Velocity matching electrode structure for electro-optic...
Zero-order diffractive filter