Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1996-04-02
1998-09-08
Tran, Thang V.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 48, 369 58, 369 52, G11B 2719
Patent
active
058055495
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.
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Brannon Clifford R.
Fite Barry A.
Kunz Russ A.
Mitchell Michael L.
Digital Audio Disc Corporation
Frommer William S.
Sony Corporation
Tran Thang V.
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