The presentation is supposed to help people realise that data produced by wearable devices may significantly improve whole sectors of services (disabled people services, healthcare, fitness, ...) but are critical for privacy protection, and also security of data subjects. The presentation is supposed to educate people of legal limits of personal data processing, their rights as personal data subjects and also help them with requiring higher standard of their personal data processing. Because if we do not solve privacy risks, we therefore allow the creation of security risks, which may endanger further development of wearable devices and put in danger even human lives (especially in health sector wearables).