42Furthermore, it is clear from the third sentence in Article 15(1) of Directive 2002/58 that measures taken by the Member States must comply with the general principles of EU law, which include the principle of proportionality, and ensure respect for the fundamental rights guaranteed by the Charter. In that regard, the Court has previously held that the obligation imposed on providers of electronic communications services by a Member State by way of national legislation to retain traffic data for the purpose of making them available, if necessary, to the competent national authorities raises issues relating to compatibility not only with Articles 7 and 8 of the Charter, relating to the protection of privacy and to the protection of personal data, respectively, but also with Article 11 of the Charter, relating to the freedom of expression (judgment of 6 October 2020, La Quadrature du Net and Others, C‑511/18, C‑512/18 and C‑520/18, EU:C:2020:791, paragraph 113 and the case-law cited).
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