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Collaborative portals are emerging as a viable technology to allow groups of individuals to easily author create, up-date, and share content via easy-to-use web-based interfaces. Freeware and open source products (e.g., SourceForge's MediaWiki) as well as commercial solutions (e.g., Microsoft's Sharepoint) are prevalent in today's marketplace. From a security perspective, these products are often very limited and coarse grained in both their authorization and authentication. For example, in the case of Wikis, the security model ranges from anonymous users no authorization and limited access to the feature-rich system via registration with rigid roles, super users, and read-only browser.
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