They're already quite happy to search your mobile devices for pr0n, so I don't imagine searching them for unclassified apps would be too big a step.

To get a full understanding of why this is something to be concerned about, you need to remember that the Restricted Access System Declaration 2007, content rules targeted at the internet, comes into force in 20 days. Among other things, this:

• prohibits X18+ and RC content.
• prohibits R18+ content, unless it is subject to appropriate access restrictions.
• prohibits commercial MA15+ content, unless it is subject to appropriate access restrictions.
• requires providers of hosting services, live content services, link services and commercial content services to have in place access restrictions if providing R18+ and commercial MA15+ content.
• requires that records of who has been authorised to view what by which means be kept for two years
• allows for 'take down', 'service cessation' and 'link deletion' notices to remove content or access to content that is the subject of a complaint

This, in and of itself, is pretty much unenforceable, as it just means our major content providers will move offshore or, at most, stop providing content that's aimed at teens altogether. But if a) X18+ and RC content is illegal for all Australians to view b) the government requires filtering at an ISP level and c) the ISPs will likely not be allowed to tell us what they filter out, one must ask: how 'dirty' is the unfiltered feed going to be? Really? Because our content laws are very restrictive - the X18+ and RC ratings cover a very, very broad swathe of material indeed, a lot of which is perfectly legal in places like the US, UK and western Europe. They only reason we don't feel the sting of our censorship laws more often is because our law enforcement agencies see enforcing the ones that don't deal with child pornography to be an utter waste of time and money.