Spoke to solicitor friend of mine regarding this.
As many people use laptops/notebooks for business (including ailrline crew!),there is often personal and financial info on these machines,so the view of the law is that you DO NOT have to hand over such info to anybody - INCLUDING customs..
Hence the reason why the MAS capt/FO was asked to pay a fine,as opposed to a courtcase..which would certainly have failed to get anyone convicted.I'm not trying to justify any form of porn etc on computers,but there you go..
So..next time you're down in Oz and they ask you to switch on your laptop or hand it over for inspection..just say "NO"