CD-ROM with machine-readable i.d. code
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United States of America Patent
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-
Apr 30, 1996
Issued Date -
N/A
app pub date -
Nov 29, 1994
filing date -
Oct 6, 1993
priority date (Note) -
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status (Latency Note)
Importance
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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