According to auDA, the new framework streamlines more than 30 previous policies.
Some of the changes were designed to promote greater trust and confidence in the .au domain, the organisation explains.
Changes include updates to the eligibility and allocation rules for the com.au, net.au, org.au, asn.au and state and territory namespaces; the terms and conditions for .au domain names; the complaints and cancellations processes; and the rules for sub-domains, third-party use and monetisation of .au domains names.
"All names created, transferred, or renewing from today will be subject to the new rules," warned auDA.
However, the previous rules will apply until the end of the current licence period for current .au domain name licences that have not yet expired or been transferred.
The adoption of the new framework follows consultations with the public during 2018 and 2019.
auDA has conducted more than 20 training sessions for registrars and responded to more than 250 registrant enquiries about thechanges.
It has also performed more than 900 audits of existing registrations to help guide compliance with the new rules.
"The .au registry has grown to more than 3.3 million domain names under management. The new licensing framework enables .au to continue as the trusted domain for local businesses, sole traders, individuals, associations, governments, educational institutions, not-for-profits and charities," said auDA CEO Rosemary Sinclair.