Judgment of the Court (Third Chamber) of 17 February 2005 in Case C-134/03: (reference for a preliminary ruling from the Giudice di pace di Genova-Voltri) Viacom Outdoor Srl v Giotto Immobilier SARL (Freedom to provide services — Competition — Bill-posting services — Domestic legislation imposing a municipal tax on advertising — Supply by municipalities of a public bill-posting service — Power of the municipalities to regulate the supply of bill-posting services — Internal taxation not discriminatory)