“…Technologies with privacy-preserving video-sensing are also being developed (Belbachir et al, 2010). These technologies, following the principles of privacy-by-design (Ahonen et al, 2010;Batchelor et al, 2012;Cavoukian et al, 2010;Friedewald and Raabe, 2011;Kosta, Pitkänen, et al, 2010), do not infringe on privacy during their use (for example, due to strong data encryption on the physical layer (Chan, Estève, et al, 2008) or because they are based on wearable technologies (Piasek et al, 2013)). …”