Having control over personal data is regarded as a fundamental right in the EU. Since the General Data Protection Regulation (GDPR) became enforceable May 2018, old rights were strengthened, and a range of new rights were introduced. How to navigate the changing landscape of data subject rights under the GDPR framework is the focal point of this volume. At the centre of this discussion are five key rights: the right to information, the right to access, the right to data portability, the right to be forgotten, and the rights related to profiling (the right to object and the right not to be subject to automated decision-making). With a focus on how these fit into big data economies, this book gives practitioners and activists the knowledge of how to pursue claims while also pointing out inefficiencies where data subject rights are concerned in a big data environment. As legal guidance slowly develops and still appears fragmented, this volume tackles the gaps and provides a thorough analysis of data subject rights under the new GDPR framework and their legal operation.