The "Cassis de Dijon principle" derived from this ruling of the European Court of Justice on 20 February 1979 generally states that all products which have been manufactured in accordance with the regulations in force in one EU member state may be sold in all other member states, irrespective of the regulations that may differ for such a product in those states. Accordingly, a Member State may only restrict the free movement of goods within the EU for very specific reasons in the public interest (fiscal control, protection of public health and fair trading and consumer protection).
The ruling was based on the fact that the German trading group REWE imported the currant liqueur Cassis from Dijon in Burgundy and sold it in its stores. Thereupon, the Federal Monopoly Administration for Brandy banned the further import and sale of the goods from France because the alleged liqueur with its alcohol content of 16 to 22% vol. did not comply with the 25% vol. alcohol content required by the German Brandy Monopoly Law for liqueurs. REWE's claim was upheld in the judgement on the grounds that the ban was "incompatible with the European freedom of movement of goods". This ruling subsequently had a prejudicial effect. See also under Wine Law.