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Location privacy in mobile services has the potential to become a serious concern for service providers and users. Existing privacy protection techniques that use k-anonymity convert an original query into an anonymous query that contains the locations of multiple users. Such techniques, however, generally fail in offering guaranteed large privacy regions at reasonable query processing costs. In this paper, we propose the PAD approach that is capable of offering privacy-region guarantees. Todoi:10.1145/1626536.1626540 dblp:conf/mobide/LuJY08 fatcat:6xcqodtiu5d7vgti5ibl556j64