Illegal copy prevention apparatus
US5295187A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 5, 1991 |
| Grant date | Mar 15, 1994 |
| Priority date | — |
| Expiry date | Dec 5, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/121
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An illegal copy prevention apparatus including a plurality of illegal copy discriminators (e.g. instructions to set flags), an event generator (e.g. detections of "0" sec in real time) corresponding to the illegal copy discriminators, and an abnormal operation generator for generating an abnormal operation when any one of the illegal discriminator and the corresponding event generator generates an event. Since the probability at which all the abnormal operations are generated by all the abnormal operation generators is low, it is extremely difficult for a violator to notice the presence of all the copy protections and further remove all the copy protections completely, thus realizing an effective illegal copy prevention apparatus for computer software and circuit configuration of IC devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.