Judgment_paragraph 223 · Hungary v European Parliament and Council of the European Union (C-156/21)

223According to the Court’s settled case-law, the principle of legal certainty requires, on the one hand, that the rules of law be clear and precise and, on the other, that their application be foreseeable for those subject to the law, in particular, where they may have adverse consequences. That principle requires, inter alia, that legislation must enable those concerned to know precisely the extent of the obligations imposed on them, and those persons must be able to ascertain unequivocally their rights and obligations and take steps accordingly (judgment of 29 April 2021, Banco de Portugal and Others, C‑504/19, EU:C:2021:335, paragraph 51 and the case-law cited).