Method for using a deep image hologram as a security device...
Method of legitimate product identification and seals and identi
Method of preventing forgery of diffraction grating pattern and
Method of printing security documents
Method of reading hologram information
Monochromatic-light reproduction type hologram, and method and a
Multi-layer hologram label
Multiply recorded hologram for security
Non-continuous holograms, methods of making them and articles in
Optical authentication device
Optical element and method for the production thereof
Optical element and method for the production thereof
Optical element and method for the production thereof
Optical feature, in particular for documents of value, and a...
Optical fiber illumination device and inspection apparatus
Optical recording medium and apparatus of judging fake thereof
Optical structure
Optically variable element
Optically variable element and the use thereof
Optically variable security attribute