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Mark forming apparatus, method of forming laser mark on optical disk, reproducing apparatus, optical disk and method of producing optical disk

a mark forming and laser mark technology, applied in the field of mark forming apparatus, can solve the problems of copyright owner financial loss, infringing copyright owners' rights, spreading of pirated disks, etc., and achieve the effect of preventing piracy, high degree, and preventing the production of pirated disks

Inactive Publication Date: 2007-05-22
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides a new method for preventing piracy of optical disks that overcomes the problems of the prior art. The invention involves the use of a physical mark on the reflective film of a disk, rather than the master disk level, to prevent the production of pirated disks. The physical mark is formed on the reflective film using a laser and is detected with high accuracy. The invention also includes the use of a two-disk laminated ROM disk with a position information identifier for each disk to enhance security. Additionally, the invention provides a method for secondary recording of ROM disks with a high degree of security using a digital signature. The invention also includes the use of a master key and a subkey to prevent the alteration of the encryption algorithm used in the manufacturing process. Overall, the invention provides a more effective and secure way to prevent piracy of optical disks."

Problems solved by technology

With increasing use of ROM-type optical disks in recent years, pirated disks have also been spreading, infringing the rights of copyright owners.
This necessarily means a financial loss to the copyright owner.
However, since it is possible to extract this physical mark by examining a legitimate disk, the prior art method has had the problem that pirated disks may be made if such a special mastering apparatus falls into the hands of an illegal person.
This method requires much time and cost to produce one master disk, but since hundreds of thousands of disks can be produced from one pirated master disk, the cost per pirated disk is low.
This has therefore given rise to the problem that as the replica method becomes widespread in the future, it may defeat the effectiveness of piracy prevention techniques at the master disk level.
As described above, the prior art piracy prevention techniques have several problems to be overcome.
Problems 1: The effectiveness of the master disk level piracy prevention techniques of the prior art is low since it is possible to replicate the physical mark.
Problem 2: In the prior art method that forms a physical mark based on physical mark design data, if a manufacturing apparatus of the same precision as the apparatus used by the legitimate disk manufacturer is obtained, illegal disks can be easily manufactured.
Problem 3: Since the security level provided by the prior art piracy prevention methods is fixed, its effectiveness decreases against constantly improving pirating techniques.
The use of copy protection is therefore limited to closed specifications such as game disks.
Problem 5: According to the prior art methods, a limited number of licensing companies possess the special manufacturing apparatus and do not make the apparatus public.
Therefore, software makers cannot make disks except at the licensing companies.
As a result, password security cannot be maintained unless a floppy disk or a communication line is used in combination.
Furthermore, the password has to be entered each time the disk is used since secondary recording is not possible.

Method used

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  • Mark forming apparatus, method of forming laser mark on optical disk, reproducing apparatus, optical disk and method of producing optical disk
  • Mark forming apparatus, method of forming laser mark on optical disk, reproducing apparatus, optical disk and method of producing optical disk
  • Mark forming apparatus, method of forming laser mark on optical disk, reproducing apparatus, optical disk and method of producing optical disk

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Embodiment Construction

[0078]The constitution and operation of a marking forming apparatus, a method of forming a laser marking to an optical disk, a reproduction apparatus, an optical disk, and a method of manufacturing an optical disk will be described below in accordance with an embodiment of the present invention.

[0079]In the description of the present embodiment given herein, the first half part (1) deals with such operations as manufacturing a disk, forming a marking by using a laser, reading position information of the marking, performing encryption and other processing on the position information, etc. for writing on an optical disk, and reproducing the optical disk on a player. The encryption and reproduction operations are briefly described in the first part (1).

[0080]Next, in the second half part (2), the encryption and other processing of the marking position information, etc. and the decryption and reproduction of the position information, etc. on the optical disk, briefly described in the fi...

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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.

Description

[0001]This application is a reissue of U.S. application 08 / 560,015. Ser. Nos. 10 / 020,425 and 10 / 183,658 are divisions of 08 / 560,015. This application and applications 10 / 017,965, 10 / 017,973, 10 / 020,427, and 10 / 183,205 are reissue applications of U.S. application No. 08 / 560,015, now U.S. Pat. No. 5,761,301. Application Ser. Nos. 10 / 020,425 and 10 / 183,658 are divisions of the instant application 09 / 588,364.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a marking forming apparatus, a method of forming a laser marking to an optical disk, a reproduction apparatus, an optical disk, and a method of manufacturing an optical disk, which may be utilized, for example, to prevent duplication of optical disks.[0004]2. Description of the Prior Art[0005]With increasing use of ROM-type optical disks in recent years, pirated disks have also been spreading, infringing the rights of copyright owners.[0006]This is because ROM disk manufacturing apparatu...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04L9/00
CPCH04K1/00H04K1/003G11B20/00086
Inventor OSHIMA, MITSUAKIGOTOH, YOSHIHO
Owner PANASONIC CORP
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