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Delimiting the concept of personal data after the GDPR

Abstract This paper explains how the concept of personal data should be delimited. Certainty on this matter is crucial, as it determines the material scope of the data protection obligations. The primary boundary delimiting the scope of personal data is the requirement that personal data ‘relate to’ an individual. The courts of the UK and the EU have sought to delineate this boundary, but there are serious difficulties in the present approaches that have emerged thus far. Two possible ways forward are suggested, taking into account the implications of the direct application of the GDPR in the UK.