Code operated access control system for electronic data store
US4868736A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 10, 1987 |
| Grant date | Sep 19, 1989 |
| Priority date | — |
| Expiry date | Aug 10, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2221/2137
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system for controlling access such as time access by a user to a store of information in an information storage system which uses unique codes associated with corresponding number of information units. The system includes a key storage unit (18) which is specifically formatted and can only be accessed by a special read/write program available to the distributor or manufacturer. The key storage unit (18) has a plurality of keys (16) which act as addresses for time units which control the time of operation the program is to be run using the host system clock (14). In response to a valid key being given to the user and being entered to start the program, the number of timed units for this code is rendered subsequently inaccessible, by for example being set to zero automatically so that it cannot readily be used again for free. The program can then be run continuously until an accumulated predetermined time is reached and at the end of the time, program operation is terminated. The user can extend operation by obtaining additional keys, subject to payment, to run the program for as long as suitable. With this system the user does not buy the computer program but effectively hires it …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.