Authority for the Protocol derives from the Statistics & Registration Service Act, 2007 which received Royal Assent on 26 July 2007.
Daw’r awdurdod ar gyfer y Protocol o Ddeddf Ystadegau a'r Gwasanaeth Cofrestru 2007 a gafodd y Cydsyniad Brenhinol ar 26 Gorffennaf 2007.