Date Added: Oct 2011
As the prosperity of digital content in the Internet and the development of mobile computing, portable devices have become increasingly powerful and widely used in daily life. Online digital library service allows people to freely enjoy information services anytime and anywhere, which arise the revolutionary change of daily life. However, there are still a lot of piracy and infringement issues of online dissemination of digital content. Digital rights protection is focused by many researchers in the field of digital content.