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In this paper, we propose an attribute based access control (ABAC) approach for safely sharing knowledge in a collaborative environment. Indeed, existing similar systems facilitate collaboration at the risk to convey doubtful information and sometimes serve as a gate to vandalism. Our system called "Wise-Share" ensures collaboration while focusing on the reliability of the broadcasted content. To achieve this goal, we precisely express the requirements needed to control the shared information. In addition, we define a formal framework for specifying security policies governing contributions requests according to user profile. We present also a prototype implementing the functionalities of our system. In our approach, a new user has limited rights. On an ongoing basis, if he demonstrates his ability to produce good contributions, he gains new privileges. Conversely, if he often generates contributions with a questionable content, he loses the held privileges. Therefore, granting user requests depends closely on his previous behavior (the history). Indeed, our system encourages users to adopt a responsible attitude by focusing on the reliability of the content of their contributions instead of their frequency. Consequently, WiseShare permits to significantly minimize clumsy and malicious actions. Index Terms-Collaborative environments, knowledge sharing, attribute based access control.

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