Judgment of the Court (Eighth Chamber) of 5 October 2023.#RK v Ministerstvo zdravotnictví.#Request for a preliminary ruling from the Nejvyšší správní soud.#Reference for a preliminary ruling – Protection of natural persons with regard to the processing of personal data – Regulation (EU) 2016/679 – Article 4(2) – Concept of ‘processing’ of personal data – Mobile application – Verification of the validity of ‘EU Digital COVID Certificates’ issued pursuant to Regulation (EU) 2021/953.#Case C-659/22.