61First of all, it follows from the case-law that the acquisition of a distinctive character through use of a mark requires that at least a significant proportion of the relevant section of the public identifies the products or services concerned as originating from a particular undertaking because of the mark (Case T-399/02Eurocermex v OHIM (Shape of a beer bottle) [2004] ECR II-1391, paragraph 42; see also, by analogy, Windsurfing Chiemsee, cited in paragraph 38 above, paragraph 52, and Philips, cited in paragraph 24 above, paragraphs 61 and 62).