Method and apparatus for preventing copying of an optical disk
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 4, 1990
Grant Date -
N/A
app pub date -
Aug 18, 1988
filing date -
Dec 27, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for preventing copying of an optical disk. A software program and the basic data necessary for executing the program, as well as an erasing program are nonrewritably recorded in advance on a predetermined region of the disk. The erasing program attempts to erase the non-rewritable portion, which has no effect on the original disk, but will erase that portion of a disk which is copied. Thus, if the software program and the basic data for executing the program are copied without authorization, the copy disk is prevented from being used.
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