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

1993-10-06

1995-03-21

LaRoche, Eugene R.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369 52, 369283, 369286, 369292, 347264, G11B 2330, G11B 2338

Patent

active

054003199

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: 4677604 (1987-06-01), Selby, III et al.
patent: 4732410 (1988-03-01), Holbein et al.
patent: 4766026 (1988-08-01), Lass et al.
patent: 4872151 (1989-10-01), Smith
patent: 4891504 (1990-01-01), Gupta
patent: 4961077 (1990-10-01), Wilson et al.

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