Joined Cases C-300/98, Parfums Christian Dior SA v. Tuk Consultancy BV, and C-392/98, Assco Gerüste GmbH and R. van Dijk v. Wilhelm Layher GmbH & Co KG and Layher BVParfums Christian Dior SA v. Tuk Consultancy BV, and C-392/98, Assco Gerüste GmbH and R. van Dijk v. Wilhelm Layher GmbH & Co KG and Layher BVParfums Christian Dior SA v. Tuk Consultancy BV, and C-392/98, Assco Gerüste GmbH and R. van Dijk v. Wilhelm Layher GmbH & Co KG and Layher BV