This paper focuses on obligation of data controller associated with purpose of personal data processing. The development of IoT and big data causes privacy concern in various aspects. One of the most serious issues is that data could be collected, used or disclosed while the data subjects do not recognize it. It could be difficult to get efficient consent for one or more specific purpose from the data subject under these new technologies. The aim of this paper is to compare the relevant legal schemes in the EU, the U.S. and Japan, and reach an appropriate solution.
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