This is from the people at OzRunways:
"OzRunways is approved by CASA as a data provider under CAR 233(1)(h), which states:
The pilot in command of an aircraft must not commence a flight if he or she has not received evidence, and taken such action as is necessary to ensure, that the latest editions of the aeronautical maps, charts and other aeronautical information and instructions, published in AIP or by a person approved in writing, that are applicable to the route to be flown and to any alternative route that may be flown on that flight are carried in the aircraft and are readily accessible to the flight crew.
OzRunways is a person approved in writing, our instrument of approval is CASA instrument 44/13."