On 4 September 2025, the Court of Justice of the European Union (“CJEU”) delivered a notable judgment on what is considered pseudonymised personal data under EU data protection law. While, technically speaking, the judgment concerns the interpretation of Regulation (EU) 2018/1725 (which governs the processing of personal data by the EU institutions and bodies), it fully applies to the interpretation of the concepts of personal data and pseudonymised data under Regulation (EU) 2016/679 (“GDPR”).
This question is essential for many companies operating in the EU, and in particular Life Sciences companies handling key-coded or otherwise pseudonymised patients’ personal data in the context of research and development, supply of healthcare products and related safety monitoring.Continue Reading CJEU clarifies the concept of pseudonymised data