Apparently I'm a “local software developers who works with open-source solutions” (Also on Builder.au).

Seriously, though – it's good that the Australian government is trying to encourage open source, but that licence is pretty extreme. For example, this clause is what made me say I wouldn't touch it in any circumstances:

You must Notify Squiz.Net within 30 days of making any Modifications even if You do not intend to distribute those Modifications. Notify is defined in Clause 4.2 below. If Your Modifications are incomplete, You must still Notify Squiz of the status of your progress not less frequently than once every 30 days.

In theory I'd prefer to just pay than put up with having to deal with crap like that – although I suspect in practice I'd just use something else.