29Those provisions indicate that the purpose of Directive 89/104 is generally to strike a balance between the interest of the proprietor of a trade mark to safeguard its essential function, on the one hand, and the interests of other economic operators in having signs capable of denoting their products and services (see, in relation to the requirement of availability of colours in the case of registration as a trade mark of a colour per se, Case C-104/01 Libertel [2003] ECR I-3793).
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