Data sovereignty is a vague concept in the discourse on digital sovereignty and is used to express various aspects of the individual or social ability to deal with Big Data in a self-determined way. The mainstream claim is that current regulatory framework, political agendas and individual competencies are not sufficiently adapted to the new requirements of big data processing. The concept of data sovereignty is coined differently by various actors. As opposed to the concept of “informational self-determination” in German law, it emphasizes the possibility of data collection and processing to a greater extent; it is also referred to by some as a “lobby term”. The problems discussed in connection with data sovereignty, however, go far beyond data availability. The discourse is uneven and complex, and there are numerous overlaps with other topics, such as the legal framework and data security.