Peter Puškár v Finančné riaditeľstvo Slovenskej republiky and Kriminálny úrad finančnej správy

Principle of proportionality: The protection of the fundamental right to respect for private life at the European Union level “requires that derogations from the protection of personal data and its limitations be carried out within the limits of what is strictly necessary” (see, to that effect, judgment of 21 December 2016, Tele2 Sverige and Watson and Others, C‑203/15 and C‑698/15, EU:C:2016:970, paragraph 96 and the case-law cited). (¶112)

It is important, in that regard, to ensure that the principle of proportionality is respected. The protection of the fundamental right to respect for private life at the European Union level requires that derogations from the protection of personal data and its limitations be carried out within the limits of what is strictly necessary (see, to that effect, judgment of 21 December 2016, Tele2 Sverige and Watson and Others, C‑203/15 and C‑698/15, EU:C:2016:970, paragraph 96 and the case-law cited).