Case C-746/18: Judgment of the Court (Grand Chamber) of 2 March 2021 (request for a preliminary ruling from the Riigikohus — Estonia) — Criminal proceedings against H.K. (Reference for a preliminary ruling — Processing of personal data in the electronic communications sector — Directive 2002/58/EC — Providers of electronic communications services — Confidentiality of the communications — Limitations — Article 15(1) — Articles 7, 8 and 11 and Article 52(1) of the Charter of Fundamental Rights of the European Union — Legislation providing for the general and indiscriminate retention of traffic and location data by providers of electronic communications services — Access of national authorities to retained data for the purpose of investigations — Combating of crime in general — Authorisation given by the public prosecutor’s office — Use of data in criminal proceedings as evidence — Admissibility)