Wearables, fitness trackers, medical apps, and similar analytical tools are currently in high demand in the e-health market. But are they safe in terms of data protection? This book offers an initial orientation in the complex field of technical and legal requirements for data protection and data security in the e-health sector, supporting all industry participants in effectively and safely shaping the digitalization of healthcare. Data security and data protection are considered the central challenges that must be ensured in the implementation of e-health. The authors, experts in data security and data protection, outline the current developments of data processing products in the e-health sector, highlight the current challenges surrounding data protection and data security, and provide initial results from empirical studies.