CD-ROM with machine-readable i.d. code

Details CD-ROM with machine-readable i.d. code CD-ROM with machine-readable i.d. code

1994-11-29

1996-04-30

Nguyen, Tan T.

Dynamic information storage or retrieval

Storage medium structure

369273, 369286, 369292, 369 52, 380 3, 235494, G11B 700

Patent

active

055131697

ABSTRACT:
A machine-readable serial number is formed on a CD-ROM by using a laser to selectively remove a reflective layer from the CD-ROM, Removal of the reflective layer creates defects in addressable information storage locations on the CD-ROM, The serial number is read by detecting the defects, The serial number is used in a software distribution system in which many different software programs are distributed on a single CD-ROM and an access code based on the desired software program and the serial number of a particular CD-ROM is used to "unlock" the desired program on the particular CD-ROM,

REFERENCES:
patent: 4341952 (1982-07-01), John et al.
patent: 4961077 (1990-10-01), Wilson et al.
patent: 5430281 (1995-07-01), Lentz et al.

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