Secret surveillance over your communications and activities, as well as the search and seizure of your electronic devices and data indisputably limit the right to control the use of your personal data and thus the enjoyment of your right to private life. If you believe that the investigative and operational activities taken are unlawful and/or disproportionate, you can challenge the decisions and actions taken by the public authorities.
Joint publication by the the EU Agency for Fundamental Rights and the Council of Europe
9 October 2015
See Summary on case law regarding the access to data
(2019-2019), pages 44-49