Software licensing is the development of software protection. First summarize software protection technology. On the basis,focus on software licensing technology including latest cloud licensing and SaaS( software as a service) technology,their characteristics and problems to be solved are also included. Finally, the challenges of software licensing comes from virtualization are analysed and discussed. According to analyzing the reasons of software licensing problems, a conclusion is got that SaaS is a new business mode and it can solve the problems as long as it ensures the safety of users. The purpose is to point out the software licensing existing issues and development direction.%软件授权是软件保护技术的延伸与发展.首先对软件保护技术进行了简单的分析和概括.在此基础上重点介绍了软件授权技术,分析了最新发展的云授权和软件即服务(SaaS)技术的特点以及需要解决的问题.最后对虚拟化技术的应用给软件授权带来的新问题进行了探讨.通过对各种问题引发原因的分析,得出SaaS作为一种创新的商业模式,只要能保证使用者的安全性,SaaS将会解决软件授权目前面临的许多问题.目的是对软件授权技术进行全面的分析与研究,指出软件授权技术面临的新问题以及今后的发展方向.
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