Bem, os DVDs canadenses são a região 1 e os australianos são a região 4 ( Wikipedia ), portanto, é necessário alterar a região da sua unidade de DVD.
Mas você só pode alterar a região um número limitado de vezes. Da mesma página da Wikipédia:
Older DVD drives use RPC-1 ("Regional Playback Control") firmware, which means the drive allows DVDs from any region to play. Newer drives use RPC-2 firmware, which enforces the DVD region coding at the hardware level. These drives can often be reflashed or hacked with RPC-1 firmware, effectively making the drive region-free. However, this usually voids the warranty.[11]
In most computer drives, users are allowed to change the region code (i.e. change region code) up to five times.[12] However, if the number of allowances reaches zero, the region last used will be permanent even if the drive is transferred to another computer. This limit is built into the drive's controller software, called firmware. Resetting the firmware count can be done with first- or third-part software tools, or by reflashing (see above) to RPC-1 firmware
Existem outras maneiras de contornar isso, mas elas podem ser ilegais em certas jurisdições.