63Thirdly, it must be noted that the Court ruled in Windsurfing Chiemsee (cited in paragraph 38 above, paragraph 49), that ‘[i]n determining whether a mark has acquired distinctive character following the use made of it, the competent authority must make an overall assessment of the evidence that the mark has come to identify the product concerned as originating from a particular undertaking, and thus to distinguish that product from goods of other undertakings’.