Mark forming apparatus, method of forming laser mark on optical

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

1995-11-17

1998-06-02

Cain, David C.

Cryptography

Cryptanalysis

369272, 235494, H04K 100

Patent

active

057613010

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.

REFERENCES:
patent: 5065429 (1991-11-01), Lang
patent: 5191611 (1993-03-01), Lang
patent: 5392351 (1995-02-01), Hasebe et al.
patent: 5400403 (1995-03-01), Fahn et al.
patent: 5457668 (1995-10-01), Hibino et al.
patent: 5457746 (1995-10-01), Dolphin
patent: 5513169 (1996-04-01), Fite et al.
European Search Report dated May 15, 1997.
International Search Report dated Jan. 30, 1996.

Affiliated with

Also associated with

Rating

Mark forming apparatus, method of forming laser mark on optical does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Mark forming apparatus, method of forming laser mark on optical , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mark forming apparatus, method of forming laser mark on optical will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1470166