A Service Definition for Data Portability

Data portability is one of the new provisions that have been introduced with the General Data Protection Regulation (GDPR) in May 2018. Given certain limitations, the data subject can request a digital copy of her own personal data. Practical guidelines describe how to handle such data portability requests, but do not support in identifying which data has to be handed out. We apply a rigorous method to extract the necessary information properties to fulfill data portability requests. We then use these properties to define an abstract service for data portability. This service is evaluated in seven expert interviews.