[alastairpat]

I'm pretty sure for .au domains you need to have a connexion with the domain (either it being your name or the name of a registered business you own.)

[patrickk]

Probably the same for many other country domain suffixes. It's the same for .ie (Ireland) for example, you have to have a connection to the country as well as the domain name itself. Typical examples would be your own name or business name.