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The Web has made it easy for users to download content directly, which not only decreases the software stored on users' machines but lets content providers customize applications by combining different vendors' content. However, this ease and flexibility has a price in terms of security. Content that appears reputable might be malicious; if it is downloaded and given system access it can damage or destroy data on the user's machine as well as the host network. Thus, access to system resources must be controlled. The authors have developed FlexxGuard, a flexible content interpreter that dynamically derives protection domains and uses those domains to authorize content operations.

R. Anand, J. R. Rao, T. Jaeger and N. Islam, "A Flexible Security System for Using Internet Content," in IEEE Software, vol. 14, no. , pp. 52-59, 1997.
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