Information recording media and optical disc presenting a charac

Details Information recording media and optical disc presenting a charac Information recording media and optical disc presenting a charac

1994-09-07

1997-03-04

Neyzari, Ali

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692751, 369103, G11B 724

Patent

active

056087179

ABSTRACT:
A CD-ROM is provided with an area for forming a character/graphic pattern. The character/graphic pattern is formed in such a way that data, which generate on the CD-ROM two sorts of pit patterns having average reflectances different from each other to a perceptible extent, are respectively recorded inside and outside the character/graphic pattern. Unless an illegal copy disc is produced by duplicating the legal original disc of the CD-ROM at a very high precision, the character/graphic pattern of the copy disc is invisibly deformed by the discrepancy between the arrangements of the pit patterns of the copy disc and the original disc.

REFERENCES:
patent: 4677604 (1987-06-01), Selby, III et al.
patent: 4872151 (1989-10-01), Smith
patent: 4967286 (1990-10-01), Nomula et al.
patent: 5136560 (1992-08-01), Hangai et al.
patent: 5138604 (1992-08-01), Umeda et al.

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