 Personal information or data is information or data that is linked or can be linked to individual persons. Examples include explicitly stated characteristics such as a person‘s date of birth, sexual preference, whereabouts, religion, but also the IP address of your computer or metadata pertaining to these kinds of information. In addition, personal data can also be more implicit in the form of behavioural data, for example from social media, that can be linked to individuals. Personal data can be contrasted with data that is considered sensitive, valuable or important for other reasons, such as secret recipes, financial data, or military intelligence. Data used to secure other information, such as passwords, are not considered here. Although such security measures (passwords) may contribute to privacy, their protection is only instrumental to the protection of other (more private) information, and the quality of such security measures is therefore out of the scope of our considerations here.