According to the European Convention of Human Rights (ECHR) and EU law, the mere existence of legislation allowing for surveillance measures constitutes an interference with the right to private life. European courts also consider the collection of data by intelligence services to amount to an interference.
Such interference needs to be justified to be human rights compliant.
Agenția pentru Drepturi Fundamentale a Uniunii Europene
(Surveillance by intelligence services: fundamental rights safeguards and remedies in the European Union – Volume II, Summary, la p. 2; pentru întreg raportul din octombrie 2017, a se vedea aici)