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Without the dongle, the software may run only in a restricted mode, or not at all.

These are used by some proprietary vendors as a form of copy protection or digital rights management, because it is generally harder to replicate a dongle than to copy the software it authenticates. Įlectrically, dongles mostly appear as two-interface security tokens with transient data flow that does not interfere with other dongle functions and a pull communication that reads security data from the dongle. This article is limited in scope to dongles used for the purpose of copy protection or authentication of software to be used on that system. The term "dongle" was originally used to refer only to software-protection dongles however, currently "dongle" is often used to refer to any small piece of hardware that plugs into a computer. Daisy chained parallel port copy protection dongles.Ī software protection dongle is a small piece of hardware that plugs into an electrical connector on a laptop, desktop or server computer.