Traffic that does not match the specific URL is forwarded through the proxy filter.Ĭhapter 7 of a research paper by Richard Clayton provides an overview of the Cleanfeed technology. Routers on the edge redirect traffic to these sites to special HTTP proxy servers which perform the actual filtering by matching HTTP requests to URLs on the blacklist. A less confidential list of sites potentially containing blocked pages is available to ISPs. The confidential url hash blacklist contains URLs of pages (not whole sites) to be blocked. See also: Web blocking in the United Kingdom § Technologies Technical implementation In August 2015 the IWF announced it was to begin sharing the list with tech giants Facebook, Google, Twitter and Yahoo to block contents being distributed through their networks. The case ( Twentieth Century Fox Film Corp & Ors v British Telecommunications Plc ) only compels BT's ISP division to implement the block on NewzBin, it remains outside of remit of the IWF URL list which is strictly limited to blocking sites which host child sexual abuse content. BT was ordered to block access to the site in late July and in a later clarification, BT was given two weeks to implement the block starting at the end of October. In June 2011 the Motion Picture Association began court proceedings in an attempt to force BT to use Cleanfeed to block access to NewzBin2, a site indexing downloads of copyrighted content. This content is not included in the IWF URL list supplied to the online industry for blocking purposes.ĬAIC targets only alleged child sexual abuse content identified by the Internet Watch Foundation. The Internet Watch Foundation used to also take reports about racial hatred from the public and IT professionals until 2011. A report in March 2014 by the Culture, Media and Sport Committee reported 98.6% of domestic broadband lines are subject to blocking arrangements. In February 2009, the Government said that it is looking at ways to cover the final 5%. ĭespite the target for 100% coverage being set for the end of 2007, by the middle of 2008 the proportion of consumer broadband connections that were covered was only 95%. However, no legislation was ever introduced and ISPs are still free to join on a voluntary basis. Home Office minister Alan Campbell pledged that all ISPs would block access to child abuse websites by the end of 2007 and UK Home Office Minister Vernon Coaker instructed all UK ISPs to implement a version of Cleanfeed by the end of 2007 on a voluntary basis, or face legal compulsion. By the middle of 2006, the government reported that 90% of domestic broadband connections were either currently blocking or had plans to by the end of the year. Cleanfeed is a silent content filtering system, which means that Internet users cannot ascertain whether they are being regulated by Cleanfeed, facing connection failures, or the page really does not exist.īy the beginning of 2006, Cleanfeed was used by 80% of Internet service providers. BT spokesman Jon Carter described Cleanfeed's function as "to block access to illegal Web sites that are listed by the Internet Watch Foundation", and described it as essentially a server hosting a filter that checked requested URLs for Web sites on the IWF list, and returning an error message of "Web site not found" for positive matches. It was created in 2003 and went live in June 2004. In October 2013, the UK government announced that as part of anti-terrorist measures it is considering a similar technology to block "extremist" material History Ĭleanfeed is a content blocking system technology implemented in the UK by BT, Britain's largest Internet provider. Cleanfeed was temporarily extended to block Newzbin until this process was moved to ISP-specific programmes. Launched by BT as Cleanfeed in July 2004, as of 2009 the list covers 98.6% of UK internet connections. The child abuse image content list ( CAIC List) is a list of URLs and image hashes provided by the Internet Watch Foundation to its partners to enable the blocking of child pornography & criminally obscene adult content in the UK and by major international technology companies.
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