本文基于IPTV业务系统的安全需求和大规模用户的并发压力，设计并实现了高效的许可证服务系统。系统采用基于PKI的数字证书和公钥加密技术，保证了系统安全性；采用EPOLL技术和快速加密算法，提高了系统服务效率；采用基于负载均衡机制的集群技术实现系统的可扩展性。系统满足IPTV系统用户增长的需求，在实际应用中，取得了良好的效果。关键词：数字电视，数字版权管理，公共密钥基础设施[Abstract] In this paper,we implement a license server system which is of high efficiency.The PKI technology adopted in the system ensure the security of the system.We also adopt EPOLL technology and fast encrypt algorithm to improve the efficiency of the system, and adopt cluster technology based on loading balance to improve the scalability of the system.The system works well in practice.[Key words]IPTV, Digital Rights Management, PKI