"The Constitutional Court denounced mass and preventive collection of data – data about the location, duration, and the participants involved, based on the provisions of the Electronic Communications Act (Act No. 351/2011 Coll.) - as
“The Constitutional Court denounced mass and preventive collection of data – data about the location, duration, and the participants involved, based on the provisions of the Electronic Communications Act (Act No. 351/2011 Coll.) – as an extensive infringement of the fundamental right to privacy. According to the Constitutional Court, the extensiveness of the infringement was demonstrated by the very fact that collected data concerned a huge and unpredictable number of communicating parties and such collection could have induced a feeling of constant surveillance.”
See the full text: Full version of the decision invalidating the data retention in Slovakia – the legislator has 6 months to come up with compliant provisions (link) and Judgment: Full-text (link)