Dongle
A copy protection device.
When buying some expensive software you may be given a hardware 'dongle'. It looks a bit like a memory stick.
The dongle contains an encryption key that allows the software it is protecting to run.
You plug the dongle into a suitable port (USB, Parallel port etc). If the software cannot find the dongle then it will not run.
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Click on this link: Dongle
2020-10