Optical recording medium having a non-volatile identification co

Details Optical recording medium having a non-volatile identification co Optical recording medium having a non-volatile identification co

1997-03-13

1998-09-22

Dinh, Tan

Dynamic information storage or retrieval

Simultaneous diverse types of storage or retrieval

369 58, G11B 1300

Patent

active

058125019

ABSTRACT:
An optical recording medium in which a medium identification code is recorded as a nonvolatile mark which is formed through irreversible change of a recording film, such as magnetization characteristic change, deformation and formation of a hole, so as to prevent illegal copying of the optical recording medium, and a recording/reproducing method for the same.

REFERENCES:
patent: 4538059 (1985-08-01), Rudland
patent: 5072435 (1991-12-01), Bakx
patent: 5291006 (1994-03-01), Nishiguma et al.
patent: 5300764 (1994-04-01), Hoshino et al.
patent: 5463212 (1995-10-01), Oshiima et al.
patent: 5544137 (1996-08-01), Ohara et al.

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