中文摘要：

The digital content industry is becoming a new impetus for the development of the information industry as the infrastructure construction,including the optical fiber backbone transmission network and the wireless mobile access network,are being completed.Industrial analysis and technical research of the digital content become more and more important in this situation.Digital content security technology is one of the three supporting technologies in the digital content industry.The key points to guarantee digital content security include the solutions for the following problems:sale of pirated digital content,damage and pollution of illegal and harmful content to the social environment,and the means for consumers’ security and reasonable payment.These issues involve a lot of challenging scientific and technical problems such as highly efficient multimedia encryption and hiding algorithms,multimedia content recognition and filtering algorithms on network,and heterogeneous network oriented micropayment protocols.