Judgment of the Court (First Chamber) of 15 July 2004 in Case C-345/02 (reference to the Court of Justice under Article 234 EC by the Hoge Raad der Nederlanden (Supreme Court of the Netherlands)): Pearle BV and Others v Hoofdbedrijfschap Ambachten (State aid — Definition of aid — Collective advertising campaigns in favour of one sector of the economy — Financing by means of a special contribution payable by undertakings in that sector — Action taken by a body governed by public law)