Hitachi Computer Peripherals Co., Ltd.

Memory-tech Corporation

Yoshiharu Tami

Masato Otsuka

Eiji Sahota

An optical disc manufacturing apparatus () recording a BCA code constituted by plural marks and including a secret code which is modulated in a range capable of recognizing a position in a radial direction of an optical disc and/or a position in a track direction of the plural marks as the BCA code, a BCA history database () storing a history including a correspondence between the BCA code of an optical disc () recording the BCA code and the secret code, and a management center () reading the BCA code and the secret code recorded on the optical disc so as to compare both on the basis of input of the correspondence between the BCA code and the secret code stored in the BCA history database () are employed, whereby an illegally manufactured optical disc () can be easily found by inspecting the recorded BCA code and secret code.

Growing community of inventors

Ashigarakami-gun, Japan

Yoshiharu Tami