abstract: Minor correction
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% \mk{D'accord :( }
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Sensors, portable devices, and location-based services, generate massive amounts of geo-tagged, and/or location- and user-related data on a daily basis.
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The manipulation of such data is useful in numerous application domains, e.g.,~healthcare, intelligent buildings, and traffic monitoring.
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A high percentage of these data carry information of user activities and other personal details, and thus their manipulation and sharing arise concerns about the privacy of the individuals involved.
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A high percentage of these data carry information of user activities and other personal details, and thus their manipulation and sharing raise concerns about the privacy of the individuals involved.
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To enable the secure---from the user privacy perspective---data sharing, researchers have already proposed various seminal techniques for the protection of user privacy.
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However, the continuous fashion in which data are generated nowadays, and the high availability of external sources of information, pose more threats and add extra challenges to the problem.
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% \kat{Mention here the extra challenges posed by the specific problem that you address :  the Landmark privacy}
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