Case C-352/09 P: Judgment of the Court (Grand Chamber) of 29 March 2011 — ThyssenKrupp Nirosta GmbH, formerly ThyssenKrupp Stainless AG v European Commission (Appeals — Competition — Agreements, decisions and concerted practices — Community market in stainless steel flat products — Decision finding an infringement of Article 65 CS after the expiry of the ECSC Treaty on the basis of Regulation (EC) No 1/2003 — Powers of the Commission — Principles of nulla poena sine lege and res judicata — Rights of the defence — Attributability of the unlawful conduct — Transfer of liability by means of a statement — Limitation period — Cooperation during the administrative procedure)