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In pervasive computing environments, context- aware applications provide services for people by using personal information. People also make privacy decision about personal information disclosure as privacy concerns. Privacy decision depends on people's interaction situation. The trust of information collector and personal information sensitivity often enable people to make uncertain privacy decision. Therefore, we construct a fuzzy objective information system that consists of personal interaction situation history. The privacy disclosure policies are extracted from this information system under using rough set theory. The context-aware applications are assigned to an adequate privacy role with the privacy disclosure policies and situation of people's interaction. Finally, we provide a working example and the initial performance evaluation.