20It is settled case-law that Article 49 EC requires not only the elimination of all discrimination on grounds of nationality against providers of services who are established in another Member State, but also the abolition of any restriction, even if it applies without distinction to national providers of services and to those of other Member States, which is liable to prohibit, impede or render less advantageous the activities of a provider of services established in another Member State, where he lawfully provides similar services (see, inter alia, Case C-164/99 Portugala Construções [2002] ECR I-787, paragraph 16, and the case-law cited).
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