Case C-117/15: Judgment of the Court (Grand Chamber) of 31 May 2016 (request for a preliminary ruling from the Landgericht Köln — Germany) — Reha Training Gesellschaft für Sport- und Unfallrehabilitation mbH v Gesellschaft für musikalische Aufführungs- und mechanische Vervielfältigungsrechte eV (GEMA) (Reference for a preliminary ruling — Intellectual property — Copyright and related rights — Directive 2001/29/EC — Article 3(1) — Directive 2006/115/EC — Article 8(2) — Concept of ‘communication to the public’ — Installation of television sets by the operator of a rehabilitation centre making it possible for patients to watch television programmes)