Method for securing and verifying a document

Method of marking a holographic matrix and holographic matrix produced by this method

Method and Apparatus for Authentication of an Element by Encoding and Decoding Position Dependent Signals

QR code containing machine readable DNA and nanoparticles

Volume hologram resin composition, surface relief hologram resin composition, and hologram layer, hologram transfer foil and brittle hologram label using the same

Optically variable devices, security device and article employing same, and associated method of creating same