| 摘要 |
A method is provided for preventing unauthorised use of copies of computer software program wherein an electronic key incorporating a housing 3 and a multiway connector 1 capable of engaging with an input port of a personal computer is inserted into the port and a copy of the program is run from a peripheral device, an instruction contained in the program interrogating the key to receive therefrom a coded electric signal in the form of a digital number which is compared with a reference number stored in the program, the program being permitted to run further only if an exact match of the code with the reference number is obtained. <IMAGE>
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