Talk:Cleanfeed (content blocking system)

Jottings from the Clayton (2005) paper for possible inclusion in the article:

History:

Illegal to "make" indecent images of children since 1994. make includes saving and browsing. See Sommer (127) and Foundation for Information Policy Research (35)
1996 - Internet Watch Foundation - originally mainly on usenet. UK ISPs sent a report and remove image from news servers (avoids ISP being done for possession?)
2003 -only 2.4% is usenet. IWF accepts reports on sites worldwide - UK site ->UK police, offshore ->national criminal intell. service to interpol. IWF keeps database of URLs and date of illegal material
Late 2003 - BT made cleanfeed to stop own customers accessing sites on IWF blocklist
June 2004 - cleanfeed goes live. leaked to press (22)

Design: Hybrid system. 1st stage like packet dropping but packets not discarded but routed to 2nd stage content filtering system

traffic examined. if from a suspect site (some of which may be blocked) then redirected to 2nd stage filter
1st stage on destination port &ip address
2nd stage web proxy
returns 404 if matches item in database

1st stage modified packet routing within customer facing portion of bt network (using bgp)
1st stage uses Ip, 2nd stage uses URLs that are encrypted - compares hashes so that banned list is not accessible

Cleanfeed only uses port 80.

US Child Pornography Prevention Act Ashcroft v Free Speech Coalition (2002)

22 - http://observer.guardian.co.uk/uk_news/story/0,6903,1232422,00.html 35 - http://www.cl.cam.ac.uk/~rnc1/SexualOffencesBill.pdf 127 - http://isig.lse.ac.uk/news/evi.html P. Sommer: Evidence in Internet Paedophilia Cases. In A. MacVean, P. Spindler (Ed.): Policing Paedophiles on the Internet, New Police Bookshop, 2003, ISBN 1-903639-12-2. Secretlondon 03:33, 31 March 2007 (UTC)