Pseudonymisation

According to virk.dk, pseudonymisation of personal data is when certain directly identifying parameters are replaced with pseudonyms (‘codes’) that are unique identifiers. For example, civil registration numbers can be replaced by a code found on a separate list that shows the link between the civil registration number and the code.  

To the greatest possible extent, personal data must be processed in a way which makes it impossible to identify the data subjects, for example under serial numbers rather than civil registration numbers or in an encrypted form.

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