Case C-410/09: Judgment of the Court (Second Chamber) of 12 May 2011 (reference for a preliminary ruling from the Sąd Najwyższy — Republic of Poland) — Polska Telefonia Cyfrowa sp. z o.o. v Prezes Urzędu Komunikacji Elektronicznej (Act concerning the conditions of accession to the European Union — Article 58 — Directive 2002/21/EC — Commission guidelines — No publication in the OJ in the language of a Member State — Enforceability)