подключаемый к параллельному или последовательному порту электронный защитный ключ(для предотвращения несанкционированного использования программных продуктов или для обеспечения компьютерной безопасности)
висюлька(a small piece of hardware that attaches to a computer, TV, or other electronic device in order to enable additional functions such as copy protection, audio, video, games, data, or other services); хвостик(a small piece of hardware that attaches to a computer, TV, or other electronic device in order to enable additional functions such as copy protection, audio, video, games, data, or other services)
шифратор; аппаратный ключ(A security device connected to an input/output port to permit the use of a particular software package on that computer. The use of the hardware key hash permits backup copying of software but prevents its unlicensed use on additional computers); аппаратный ключ
dongle A security device connected to an input/output port to permit the use of a particular software package on that computer. The use of the hardware key hash permits backup copying of software but prevents its unlicensed use on additional computers['dɒŋɡǝl]abbr.
dongle Context-dependent(A security device connected to an input/output port to permit the use of a particular software package on that computer. The use of the hardware key hash permits backup copying of software but prevents its unlicensed use on additional computers)
wikipedia.org, habr.com inyazserg)