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US 4,785,361 AGranted
Method and apparatus for frustrating the unauthorized copying of recorded data
AssigneeVault Corporation
InventorW. Krag Brotby
Life of this patent
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AssigneeVault Corporation
InventorW. Krag Brotby
Estimating the term…
Authorized disks made in accordance with the invention are physically distinguishable from the blank disks which would be used for making unauthorized copies. A security check procedure is included in the initializing routine that is recorded on the authorized disk and that is executed prior to the reading out of any of the protected data. The security check procedure involves a test to determine whether the disk on which it has been recorded has or does not have the physical fingerprint that is the hallmark of an authorized disk. If the fingerprint is absent, the security check procedure prevents the protected material from being read out. Thus, unauthorized copies are useless because the protected data cannot be read out of them.
A method for frustrating the unauthorized copying of protected data that has been recorded in an authorized medium that includes an initializing routine that is executed before any of the protected data is read out of the authorized medium, said method comprising the steps of:
Apparatus for frustrating the unauthorized copying of protected data that has been recorded therein along with an initializing routine that is executed before the protected data can be read out, said initializing routine including instructions for generating a first series of increments and for successively incrementing a first number stored in said initializing routine each time said apparatus is used, said apparatus comprising:
Dependencies are inferred from the claim text.