Codes are something issued by health institutions such as hospitals, municipal health services or by researchers. The code is used to provide the user with content that is adapted to the user. For example, a therapist may provide a code for an Internet-based self-help program on anxiety to a user who is suffering from anxiety. A researcher can issue a code with a questionnaire.

A code is issued to protect privacy, so that no data that can be linked to your identity is stored with a third party or on the internet. When you use a code, the IP address is not logged and you can be identified by the code itself.

This means that only those who have issued the code to you can recognize who is using the internet solution if they have chosen to store this information with them. In this case, the link to this information is not stored on the internet, but with the person who gave you the code.