The technology for software copyright protection, as a very important part of the industrial-grade software, plays an important role in protecting software copyright. The industrial-grade software is transferring slowly from the traditional one-time payment authorization to the real-time online payment, scheduled payment, software leasing, and payment according to the function module. Therefore, the study on the practical technology for software copyright protection has broad application prospects and practical significance. Considering varieties of software copyright protection technologies, improving the cost of crackers to crack the software is an effective means to protect the industrial-grade software. This article describes an online control method of license authorization, which combines the registration key technology and hardware encryption lock technology. The practice shows that using the method in this paper can effectively control the functional modules, utility time or number of times, number of concurrent users and so on of the management and information system in real time, and effectively ensure the system's information security by online token access. The license control as an independent functional module can be easily transplanted to other industrial-grade software systems, so it has strong practicality and versatility.