Patent ID: 6952392

Claim:
A method for fabricating an optical medium readable by an optical reader, said method comprising the steps of: (a) molding a substrate so as to have a first major surface with information pits and information lands thereon and a second major surface that is relatively planar; (b) applying a transient optical state change security material capable of converting from a first optical state to a second optical state upon exposure to the laser of said optical reader to at least a position of said first major surface; (c) applying a reflective material over the first major surface so as to cover said information pits and information lands; wherein the transient optical state change security material comprises: where R 6 , R 7 , R 8 , and R 9 are alkylamino and R 1 , R 2 , R 3 , R 4 and R 5 are selected from the group consisting of hydrogen, alkyl, aryl, alkoxy, thioalkoxy, alkylamino, nitro, amino and halogen.