pseudonymisationpseudonymisation: in data protection law, a term coined by t...: in data protection law, a term coined by the General Data Protection Regulation (GDPR) and defined in Article 4(5) of the GDPR as, in summary, the processing of personal data in such a way that the personal data can no longer be attributed to a specific data subject without some additional information, in the form of (for eg.) an artificial identifier, code number or pseudonym.