29First, it is settled case-law that a decision adopted by a Community institution which has not been challenged by its addressee within the time-limit laid down by the fifth paragraph of Article 230 EC becomes definitive as against that person (see, inter alia, Case 156/77 Commission v Belgium [1978] ECR 1881, paragraphs 20 to 24, CaseC-183/91 Commission v Greece [1993] ECR I-3131, paragraphs 9 and 10, and Case C-188/92 TWD Textilwerke Deggendorf v Germany [1994] ECR I-833, paragraph 13). Such a rule is based in particular on the consideration that the periods within which legal proceedings must be brought are intended to ensure legal certainty by preventing Community measures which produce legal effects from being called in question indefinitely (Case C-178/95 Wiljo v Belgian State [1997] ECR M85, paragraph 19).
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