Boots – shoes – and leggings
Patent
1983-08-29
1986-04-22
Zache, Raulfe B.
Boots, shoes, and leggings
364300, 360 60, G06F 100
Patent
active
045846413
ABSTRACT:
A means for copyprotecting disks. The present invention may be utilized with both blank and programmed disks. Permanent random input/output errors such as an absence of magnetic material are placed on a disk by removal of material or by other methods and an input/output error trap routine or program is placed on the disk. The input/output error trap routine or program runs during the use of the user software program. A copied disk will not contain the permanent input/output error that existed on the original target disk because the input/output errors are not reproduced because they are not machine readable. When the copied disk is run, the input/output error trap routine cannot locate the permanent input/output error that existed on the original target disk. When the permanent input/output error is not located by the input/output error trap routine the volume table of contents on the disk is scrambled, the input/output error trap routine is deleted and the copied or pirated user software program is scrambled both in memory and on the disk. Location of the permanent input/output error by the input/output error trap routine on the target disk allows the user software program to continue normal processing.
REFERENCES:
patent: 4086634 (1978-04-01), Cook
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