The permission to process data is not always bound to the consent of the person concerned. (GDPR Art. 6 (1b): Existing or Planned Contractual Relationship, GDPR Art. 6 (1c): Legal Obligation, GDPR Art. 6 (1d): Protection of Vital Interests, GDPR Art. 6 (1e): Performance of a Task Carried Out in the Public Interest, GDPR Art. 6 (1f): Safeguarding a Legitimate Interest.)