In the worst case of Orwellian lies I've ever seen
they call this "voluntary" filtering. Voluntary for the ISP that is. NOT voluntary for the customer if the ISP goes ahead with it. So this is the backdoor method by which they impose Conjob's filter on everyone. It's purely voluntary - if you don't like it, you can go to another ISP.
Now watch what happens to ISPs who refuse to implement this "voluntary" filter. Such as Internode - my own ISP - who have stated that they will not be filtering their customers' internet. But for how long? How long before government officials and the do-gooder nannies start saying things like "Internode - the child pornographer's ISP of choice" and "What's the matter Internode? Are you guys really willing to let your customer access that filth?" and so on until they cave in from all the bad publicity.
"Voluntary" my fucking arse.