Mark forming apparatus, method of forming laser mark on...

Details Mark forming apparatus, method of forming laser mark on... Mark forming apparatus, method of forming laser mark on...

2001-12-07

2009-12-01

Moise, Emmanuel L. (Department: 2137)

Information security

Prevention of unauthorized use of data including prevention...

C705S051000, C705S062000, C380S203000, C380S241000, C369S275100, C369S272100, C369S273000, C726S030000, C726S031000, C726S032000, C726S033000

Reissue Patent

active

RE041032

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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