Optical recording method having two degrees of reflectivity and a diffraction grating or hologram formed integrally thereon and process for making it

An optical recording medium comprising:

• a substrate;
• and
• means for displaying information on said substrate, said means for displaying information including a first information pattern encoded in either an area of first reflectivity or an area of second reflectivity, and a second information pattern encoded in a diffraction grating or hologram formed integrally with said substrate and superimpsoed on said area of first reflectivity.

An optical recording medium comprising:

• a substrate, said substrate having an information recording area having a first portion of first reflectivity and a second portion of second reflectivity;
• and
• means for inhibiting counterfeiting, said means including a diffraction grating or hologram formed integrally with said substrate and superimposed on said first portion of first reflectivity or said second portion of second reflectivity.