30It is thus settled case-law that the exclusive right under that provision was conferred in order to enable the trade mark proprietor to protect his specific interests as proprietor of that mark, that is, to ensure that the trade mark can fulfil its functions. Therefore, the exercise of that right must be reserved to cases in which another party’s use of the sign adversely affects or is liable adversely to affect one of the functions of the trade mark. Those functions include not only the essential function of the trade mark, which is to guarantee to consumers the origin of the goods or services in question, but also its other functions, such as that of guaranteeing the quality of those goods or services or those of communication, investment or advertising (Case C‑661/11 Martin Y Paz Diffusion [2013] ECR, paragraph 58 and the case‑law cited).
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