Case C-450/06: Judgment of the Court (Third Chamber) of 14 February 2008 (reference for a preliminary ruling from the Conseil d'État (Belgium)) — Varec SA v Belgian State (Public procurement — Review — Directive 89/665/EEC — Effective review — Meaning — Balance between the adversarial principle and the right to observance of business secrets — Protection, by the body responsible for the review, of the confidentiality of information provided by economic operators)