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There are many different definitions and understandings of the concept of privacy. Here we bring all the different aspects of privacy together and propose a comprehensive definition thereof. We also introduce the three different approaches to privacy preservation, and propose a comprehensive and multi-faceted approach in order to gain from the benefits of each and maximise privacy protection. We report on the evaluation of a prototype of such a privacy protective shopping environment.
Renaud et al. (Sun,) studied this question.