Case C-536/11: Judgment of the Court (First Chamber) of 6 June 2013 (request for a preliminary ruling from the Oberlandesgericht Wien — Austria) — Bundeswettbewerbsbehörde v Donau Chemie AG, Donauchem GmbH, DC Druck-Chemie Süd GmbH & Co KG, Brenntag Austria Holding GmbH, Brenntag CEE GmbH, ASK Chemicals GmbH, formerly Ashland-Südchemie-Kernfest GmbH, ASK Chemicals Austria GmbH, formerly Ashland Südchemie Hantos GmbH (Competition — Access to the file — Judicial proceedings relating to fines for infringement of Article 101 TFEU — Third-party undertakings wishing to bring an action for damages — National rules making access to the file subject to the consent of all parties to the proceedings — Principle of effectiveness)