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Context-aware applications can better meet users' needs when sensing agents installed in the environment automatically provide input relevant to the application. However, this nonintrusive context usage may cause privacy concerns since sensitive user data could be leaked to unauthorized parties. Therefore, data privacy protection becomes one of the major issues for context-aware applications. In this paper, in order to provide services based on various levels of privacy concerns, we extend thedoi:10.1145/1085777.1085779 dblp:conf/mhci/HongYS05 fatcat:ebq7hu4jovganb5rzlaqh3yzcq