Judgment of the Court (Grand Chamber) of 5 December 2023.#Nacionalinis visuomenės sveikatos centras prie Sveikatos apsaugos ministerijos v Valstybinė duomenų apsaugos inspekcija.#Reference for a preliminary ruling – Protection of personal data – Regulation (EU) 2016/679 – Article 4(2) and (7) – Concepts of ‘processing’ and ‘controller’ – Development of a mobile IT application – Article 26 – Joint control – Article 83 – Imposition of administrative fines – Conditions – Requirement that the infringement be intentional or negligent – Responsibility and liability of the controller for the processing of personal data carried out by a processor.#Case C-683/21.