The 'once only' principle should be implemented in full compliance with Regulation (EU) 2016/679, in particular on the basis of the user's consent, and with the principles of privacy and security by design.
Načelo „samo enkrat“ bi bilo treba izvajati popolnoma v skladu z Uredbo (EU) 2016/679, zlasti na podlagi privolitve uporabnika, ter z načeli zasebnosti in varnosti po zasnovi.