I bought 3 disney movies from the us can'play them on my dvd need a code area australian

Of course I cannot condone any solution contrary to any Australian, US, or international law.

Most DVD players offer the option to change the region code...
Please be aware that due to DVD piracy problems, every DVD player manufactured, regardless of who makes it or where it is made, allows a maximum (if at all) of THREE region code changes.
In your circumstance, this would mean that you can change your DVD player region code to region 1 (US), watch your videos, and then change it back to the AU region code...You would then be allowed one more change. If you attempt to change the region code after that, your DVD player would lock out and be turned into a paperweight.

As a "Yank" who has been to Australia (Perth NSW- twice!) I sympathize with your problem- wanting to have these videos forever and not being able to watch them at all....

The only "safe" option that I can offer is to surf the web for a program called DVD-Shrink, or something similar that will allow you to remove the region code from your DVD's, and set it to "region zero"...which will play the DVD anyplace, anytime. DVD-Shrink works as a copy program from a PC DVDR drive and can remove most region codes from a DVD depending on the disc- most is explained in the FAQ.

Please do not allow yourself to be duped into trying an "all regions" download for your DVD PLAYER. Every single one that I have received a reply about, after warning off the "customer" has resulted in a "my player does not work anymore" response!