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The illegal distribution of duplicated contents on the Web is causing digital content providers great economic loss. Therefore, Information security is becoming a more important factor in distribution of digital contents. In this study, we designed a digital contents distribution system based on the public key techniques in hierarchical web caching structures. The superior performance of the proposed system has been proven in the experimental tests. The results of experiment show that the supposed system improved the security of DC without decreasing process speed and improved user convenience. [ABSTRACT FROM AUTHOR]