This paper firstly introduced some existing software protection techniques. After analyzing the disadvantages of these techniques,this paper expounded a software authorization control technique based on the Web,E-mail system and MD5 encryption algorithm.

• 本文在分析目前已有的软件保护技术不足的基础上 ,阐述了一种基于网络、E -mail系统和MD5加密算法的软件保护技术。