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This paper advocates research into techniques that support the extraction, sharing, and utilization of knowledge for collaborative problem solving applications. this paper present a system framework for secure knowledge management, called PBKM, which in addition to providing standard security mechanisms such as access control, will possess three crucial features, namely, privacy-preservation which should be ensured in a knowledge-extraction procedure, breaching-awareness which should be taken into consideration in the knowledge-dissemination procedure, and abuse-accountability which is incorporated in the management of knowledge.
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