Case C-620/18: Judgment of the Court (Grand Chamber) of 8 December 2020 — Hungary v European Parliament, Council of the European Union (Action for annulment — Directive (EU) 2018/957 — Freedom to provide services — Posting of workers — Terms and conditions of employment — Remuneration — Duration of posting — Determination of the legal basis — Articles 53 and 62 TFEU — Amendment of an existing directive — Article 9 TFEU — Misuse of powers — Principle of non-discrimination — Necessity — Principle of proportionality — Extent of the principle of freedom to provide services — Road transport — Article 58 TFEU — Regulation (EC) No 593/2008 — Scope — Principles of legal certainty and legislative clarity)