Judgment of the Court of 10 December 2002 in Case C-153/00 (Reference for a preliminary ruling from the Onderzoeksrechter in de Rechtbank van eerste aanleg te Turnhout): Paul der Weduwe (Freedom to provide services — Banking activities — Employee of a credit institution established in a Member State and canvassing for clients in another Member State — National legislation on banking secrecy — Refusal to answer questions and to give evidence in a judicial investigation)