Abstract
Digital libraries (DLs) introduce several challenging requirements with respect to the formulation, specification and enforcement of adequate access control policies. Unlike conventional database environments, a DL typically is characterised by a dynamic subject population, often making accesses from remote locations, and by an extraordinarily large amount of information, stored in a variety of formats. Additionally, protecting a DL does not only mean protecting documents that reside at the DL site, but also protecting accesses that the DL subscribers made to external Web documents. We present MaX, a comprehensive system for enforcing access control, specifically tailored to both DL and Web environments. Key features of MaX are the support for credential and content-based access control to DL and Web documents, and its full integration with standard Internet rating systems.
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