These boundaries are from the PSMA Administrative Boundaries dataset.
This dataset has been released under an End User Licence Agreement (EULA) based on the Creative Commons Attribution 4.0 International license (CC BY 4.0).
The EULA requires the following attribution:
Incorporates or developed using G-NAF ©PSMA Australia Limited licensed by the Commonwealth of Australia under the Open Geo-coded National Address File (G-NAF) End User Licence Agreement.
Data processed from original to OSM format by Andrew Harvey (https://github.com/andrewharvey/psma-admin-bdy2osm).
Candidate place nodes for labels are copied from OpenStreetMap (ODbL license).