ISPs tend to block content suggested by the IWF quickly, because it's in their best interests to do so. The IWF has a tight focus. Their clear about only wanting to keep the blocking they do separate from other forms of blocking - preventing children seeing adult content, for example. (http://www.iwf.org.uk/about-iwf/news/post/366-iwf-response-t...)
> We welcome the Prime Minister making the clear distinction between the fight against online child sexual abuse content and efforts to prevent legal material being viewed by those who are underage. It is critical that these debates are kept separate.
So it seems that the court blocks are only about forcing ISPs to block the Pirate Bay or Kickass Torrents and the various proxies used to evade those blocks.
The article supports this:
> Once a judge has decided that a website deserves to be blocked under Section 97A of the Copyright Act, each ISP is sent a court order describing the actions they must take to block the website. It specifies the kind of blocking to be undertaken. The court order contains other important information, including the name of the organisation responsible for mistakes and changes to the lists of clone sites to be blocked.
So in other words: It isn't feasible.
The paper linked on his page here - (http://www.cl.cam.ac.uk/~rnc1/)
> I examined BT's CleanFeed system (its proper name is the BT Anti-Child-Abuse Initiative). This was designed to be a low cost, but highly accurate, system for blocking "child pornography". At first sight it is significant improvement upon existing schemes. However, CleanFeed derives its advantages from employing two separate stages, and this hybrid system is thereby made more fragile because circumvention of either stage, whether by the end user or by the content provider, will cause the blocking to fail.
The UK can be very opaque at times and it would be nice to see what is going on easily.
Edit: and to avoid collateral damage like [1] (shared hosting with 1 IP address)
[1] http://www.theregister.co.uk/2013/08/15/site_blocking_after_...
in the real world you deal with real world problems - you don't get to negotiate because you feel entitled - in the general case at least people have zero tolerance for such behaviour and it gets you nowhere.
we have a capitalist society after all... supply, demand and competition rule supreme in our economy.
don't downvote this guy his point is perfectly valid.