Quad9 uses the union of the definitions of PII contained in Swiss law (Article 3 (a) FADP), United States law (2 CFR ยง 200.79) and European Union law (Article 4(1) GDPR), with the definition that extends the greatest protection to the user controlling in the event of any conflict between the three, and we extend that most stringent protection to all of Quad9's users, regardless of their citizenship or domicile.</p>