In the UK, BT (The biggest ISP) introduced CleanFeed[0] and "strongly encouraged" (read forced) to be used by the government. It was claimed that it would only

In the UK, BT (The biggest ISP) introduced CleanFeed[0] and "strongly encouraged" (read forced) to be used by the government. It was claimed that it would only ever be used for blocking child sexual abuse imagery. Recently a judge has ruled that BT must use the same system to block a website used to share links. [1] The list of blacklist sites itself can only be edited by a small group (iirc 4 people) of unelected and unaccountable people at the IWF[2] Cleanfeed is also pretty flawed, doesn't work with HTTPS, can be interrogated to get a list of blocked content (using TTLs) and misleadingly returns 404 for blocked content. [0] http://en.wikipedia.org/wiki/Cleanfeed_%28content_blocking_system%29 http://en.wikipedia.org/wiki/Cleanfeed_%28content_blocking_s... [1] http://arstechnica.com/tech-policy/news/2011/07/british-telecom-ordered-to-blacklist-usenet-search-engine.ars http://arstechnica.com/tech-policy/news/2011/07/british-tele... [2] http://www.iwf.org.uk/ http://www.iwf.org.uk/ [3] http://www.cl.cam.ac.uk/~rnc1/cleanfeed.pdf http://www.cl.cam.ac.uk/~rnc1/cleanfeed.pdf