City of Sydney Relationships Declaration
Other institutions such as the Registry of Births Deaths and Marriages no longer accepts an Australian Marriage Certificate as a form of ID – this creates an equal situation for both opposite sex and same sex couples as both are not allowed to present their relationship certificates as a form of ID.
Driver's license
Many countries, including Australia, New Zealand, Canada, the United Kingdom, and the United States, have no national identification cards. As many people have driver's licenses, they are often accepted as "de facto" proof of identity. Non-drivers can apply for equally valid state-issued identification-only cards. Most identity cards and driver's licenses are credit card size—the "ID-1" size and shape defined in ISO/IEC 7810.