Judgment of the Court (Eighth Chamber) of 19 December 2024.#MK v K GmbH.#Request for a preliminary ruling from the Bundesarbeitsgericht.#Reference for a preliminary ruling – Protection of natural persons with regard to the processing of personal data – Regulation (EU) 2016/679 – Article 88(1) and (2) – Processing in the context of employment – Employees’ personal data – More specific rules provided for by a Member State pursuant to that Article 88 – Obligation to comply with Article 5, Article 6(1) and Article 9(1) and (2) of that regulation – Processing on the basis of a collective agreement – Margin of discretion of the parties to the collective agreement as regards the necessity of the processing of personal data provided for by that agreement – Scope of judicial review.#Case C-65/23.