System and method for sensing color and preventing use of unauthorized color formulation software
US5543920A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1995 |
| Grant date | Aug 6, 1996 |
| Priority date | — |
| Expiry date | Mar 9, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2211/007
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system and a method for preventing use of unauthorized software contained at a remote location which is to be used with a device having stored information is disclosed. The device includes firmware having a hash code, and a hash function for operating on an initiation string. The device has a communication interface. A remote storage location has an initiation string. The communication interface of the device and the remote storage location are interconnected for transferring information such as the initiation string between the device and remote storage location. The result of the hash function operation on the initiation string is compared with the hash code. The communication interface is enabled when the result of the hash function operation on the initiation string and hash code contained in the firmware are the same. In the illustrated embodiment, the device is a color sensor having a sensor body. The sensor senses and stores information about the color of a selected object such as on an automobile. A serial port on the sensor body is operatively associated with the color sensor and allows interconnection to a serial port of a remote computer. The remote computer receives s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.