Guidelines 03/2019 on processing of personal data through video devices

Paragraph 7.1.1  Positioning of the warning sign

113. The information should be positioned in such a way that the data subject can easily recognize the circumstances of the surveillance before entering the monitored area (approximately at eye level). It is not necessary to reveal the positionof the camera as long as there is no doubt as to which areas are subject to monitoring and the context of surveillance is clarified unambiguously (WP 89, par. 22). The data subject must be able to estimate which area is captured by a camera so that he or she is able to avoid surveillance or adapt his or her behaviour if necessary.