Compact disc comprising an antipiracy marking and method of providing compact discs with an antipiracy marking
AssigneeDigipress
InventorJean Ledieu
Life of this patent
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Abstract
A method for providing compact discs with an antipiracy marking and a mold for pressing compact discs for making compact discs carrying an antipiracy marking as well as compact discs comprising an antipiracy marking pattern, the compact disc consisting of a substrate including on one of its sides the information to be read by the compact disc player and on the opposite side an antipiracy marking pattern.
Claims10
A compact disc comprising a substrate having first and second opposing sides, the first side including program micropits representative of information to be read by a compact disc player, the second side including micropits and/or microreliefs reflecting wavelengths of visible light, the micropits and/or microreliefs being representative of an antipiracy marking pattern and constituting an optical grating.
A method of providing a compact disc with an antipiracy marking comprising:
- pressing program information on a first side of the compact disc;
- and
- simultaneously transferring an antipiracy marking pattern including an optical grating consisting of micropits and/or of microreliefs reflecting the wavelengths of visible light onto a second side of the compact disc.
Dependencies are inferred from the claim text.