Case C-122/09: Judgment of the Court (Fourth Chamber) of 22 April 2010 (reference for a preliminary ruling from the Simvoulio tis Epikratias (Greece)) — Enosi Efopliston Aktoploïas and Others v Ipourgos Emporikis Naftilias, Ipourgos Aigaiou (Maritime transport — Maritime cabotage — Regulation (EEC) No 3577/92 — Temporary exemption from the implementation of that regulation — Obligation on Member States to refrain from adopting, before expiry of the period of exemption, provisions liable seriously to compromise the application of that regulation)