Methods and apparatus for the protection and control of computer programs
US4649510A · kind A · utility
50Cited by
18References
5Claims
0Family size
Inventor
Key dates
| Filing date | Apr 30, 1982 |
| Grant date | Mar 10, 1987 |
| Priority date | — |
| Expiry date | Apr 30, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2211/007
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus for the protection and control of computer programs wherein a valid program is modified to provide a furnished program and a corresponding restoration program, one or both of these are modified in accordance with confirmation data, and the furnished program, confirmation data, and restoration program data are supplied to an equipped computer installation in the form of a furnished program medium, a confirmation unit, and a restoration unit, via separate commercial channels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.