Case C-505/14: Judgment of the Court (Second Chamber) of 11 November 2015 (request for a preliminary ruling from the Landgericht Münster — Germany) — Klausner Holz Niedersachsen GmbH v Land Nordrhein-Westfalen (Reference for a preliminary ruling — Articles 107 TFEU and 108 TFEU — State aid — Aid granted in breach of Article 108(3) TFEU — Decision of a Member State court establishing the validity of the contract granting that aid — Res judicata — Interpretation in conformity with EU law — Principle of effectiveness)