Cryptography – Video cryptography – Copy protection or prevention
Reissue Patent
2002-06-25
2009-12-15
Moise, Emmanuel L. (Department: 2137)
Cryptography
Video cryptography
Copy protection or prevention
C380S203000, C380S241000, C705S051000, C705S062000, C369S275100, C369S286000, C369S272100, C369S273000, C369S053220, C235S488000, C235S489000, C235S490000, C235S494000
Reissue Patent
active
RE041041
ABSTRACT:
An object of the present invention is to provide a marking forming apparatus, a method of forming a laser marking on an optical disk, a reproduction apparatus, an optical disk, and a method of manufacturing an optical disk, capable of providing a greatly improved copy prevention capability as compared to prior known construction. To achieve this object, in the optical disk of the invention, for example, a marking is formed by a laser on a reflective film of a disk holding data written thereon and at least position information of the marking or information concerning the position information is written on the disk in an encrypted form or with a digital signature appended thereto.
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Gotoh Yoshiho
Oshima Mitsuaki
Callahan Paul
Moise Emmanuel L.
Panasonic Corporation
RatnerPrestia
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