The corresponding server in Figure 1 is the top layer - the software developer’s server, and its clients contain the middle layer - the workshop server and the bottom layer application module. The workstation PC operates the application module of the management and information system; the workshop server operates the service module of the management and information system, and the service module of license control belongs to the middle layer; the software developer’s server is responsible for the authorization of the management and information system, and after attaining the software license from the developer’s server, the license service module controls the entire operation of the management and information system.