Abstract
Some technical measures should be taken for software protection in addition to the laws and regulations. Software encryption is a commonly used method. The main methods of software encryption are introduced here firstly, and the characteristics of different methods are given. Then the idea of encryption card based on computer system bus is put forward. The design of logical circuit for the concrete realization is shown and the key detection process is described. The key is generated by the port address dynamically with the encryption card. There are several key with multi port. The encryption card is difficult to decrypt and is with good stability, high reliability.
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