Patent ID: 6477134
Filing Date: 2002-11-05
Classification: G11B,Y10S,Y10T

Abstract:
A method of marking a data disc product comprised of polycarbonate material and storing data thereon, the method used for tracking purposes to inhibit at least one of piracy, unauthorized access and unauthorized copying of the data stored on the data disc product, said method comprising the steps of:(a) introducing at least one predetermined tracing substance as a predetermined marking in the polycarbonate material of the data disc product in quantities that will not substantially adversely affect the readability of the data stored on the data disc product; (b) manufacturing the data disc product with the at least one predetermined tracing substance introduced therein in said introducing step (a); (c) identifying by inspecting the data disc product the at least one tracing substance for tracking purposes to inhibit at least one of piracy, unauthorized access and unauthorized copying of the data stored on the data disc product; and wherein said identifying step further comprises using at least one of mass spectrometry, neutron absorption and neutron spectrometry techniques.