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Content and its associated information industry are going to become emerging market and content security has attracted more attention of researchers and enterprises. In order to solve these issues, starting with the information definition of Shannon, the paper defines and describes the content security architecture, which proposes a new layering model of information transmission and layering model information security based on the results of predecessor's study. The position of content security in the layering model and the research objects of information security are discussed, then the definition of content security is given. With this architecture of content security, its components is discussed and simply researched. The work has certain significance to the theories and engineering practices.