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As pervasive environments become more commonplace, the privacy of users is placed at increased risk. The numerous and diverse sensors in these environments can record users' contextual information, leading to users unwittingly leaving "Digital Footprints." Users must thus be allowed to control how their digital footprints are reported to third parties. While a significant amount of prior work has focused on location privacy, location is only one type of footprint, and the authors expect most users to be incapable of specifying fine-grained policies for a multitude of footprints.
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