Web blocking in the United Kingdom
The precise number of websites blocked in the United Kingdom is unknown. Blocking techniques vary from one Internet Service Provider (ISP) to another with some sites or specific URLs blocked by some ISPs and not others. Websites and services are blocked using a combination of data feeds from private content-control technology companies, government agencies, NGOs, court orders in conjunction with the service administrators who may or may not have the power to unblock, additionally block, appeal or recategorise blocked content.
- 1 Programmes
- 1.1 Copyright
- 1.2 ISP Default network blocking
- 1.3 Mobile Internet Blocking
- 1.4 Internet Watch Foundation
- 1.5 Public Wi-Fi
- 1.6 Libraries and educational institutions
- 1.7 Extremism
- 2 Technologies
- 3 Responses
- 4 Circumvention
- 5 See also
- 6 References
There are a number of different web blocking programmes in the UK. The high profile default ISP filters and IWF filters have been referred to as a "pornwall", "porn filter", "Hadrian's Firewall", "Great Firewall of Britain" and the "Great Firewall of Cameron". However the programmes are usually referred to interchangeable or individually rather than collectively.
|Child porn and obscene content blocking||Child Pornography & Criminally obscene adult content||Internet Watch Foundation||ISP implementation of child abuse image content list||98.6% as of 2009|
|Copyright infringement site blocking||Copyright infringing sites subject to court orders||Rights holder organisations court orders||ISP implementation of secret court orders||97.2% as of 2014 of consumer connections|
|Default ISP Filters||Varied, see ISP Default network blocking category comparison||Broadband ISPs with varied technology partners||ISP Content-control software
|93% of new consumer connections since January 2014
Unknown percent of active connections
|Mobile Internet Filtering||Varied, see Mobile Internet Blocking||Mobile network operator with varied technology partners within the British Board of Film Classification framework||ISP Content-control software||100% of new contracts since 2004
Unknown percent of active connections
|Extremist material blocking||Extremism and Terrorism||Counter Terrorism Internet Referral Unit
||URL Blocking List||Currently Public Estate Blocking Only|
|Wifi Hotspot Filtering||Varied, see Public Wi-Fi||Arqiva, BT, Sky, Nomad Digital, Virgin, O2||ISP Content-control software||90% of public Wi-Fi as of 2013|
|Private Hotspot Providers||49% of wifi hotspots as of 2013|
|Library and educational filtering||Varied including Payday loans, see Libraries and educational institutions||Local government||Content-control software||Majority of Schools
|Corporate Filtering||Often social media, may extend to wider content||Company IT Department||Content-control software often with SSL Deep packet inspection||Unknown|
|Technical threat blocking||Malware, Phishing, Spyware etc.||ISPs with technology partners||Blacklisting||Optional, usage unknown|
|Government White List||Websites incorrectly filtered||UK Council for Child Internet Safety||TBA||Not in effect|
The technical measures used to block sites include DNS hijacking, DNS blocking, IP address blocking, and Deep packet inspection, making consistent verification problematic. One known method is ISP scraping DNS of domains subject to blocking orders to produce a list of IPs to block.
Digital Economy Act
The Digital Economy Act 2010 is the only Internet-specific legislation regarding copyright in the UK. Progress on the implementation of the Act has been slow due to resistance by ISPs and the Act's measures are not now expected to come into force until 2014 or 2015.
This Act contains several provisions restricting the downloading of copyrighted material from the Internet. Under the Act, warning letters are sent to Internet users suspected of downloading copyright-infringing material (provided their ISP has more than 400,000 customers). If a customer receives three of these letters in one year they are put on a blacklist and may be subject to a civil claim by the copyright holder under the Copyright, Designs and Patents Act 1988 (though it is first be necessary to establish their identity using a court order). After these provisions have been in force for a year, additional rules may be applied, requiring ISPs to reduce the download speed of repeat offenders and in some cases disconnect their Internet supply. The Act originally allowed the Secretary of State to order the blocking of websites which provided material that infringed copyright, although this section was dropped following the successful use of court orders to block websites. Commentators debate the practicality of such controls and the ability of the UK government to exact control
It is an established procedure in the UK for rights-holders to routinely use court orders to require ISPs to block copyright-infringing sites. For instance, court orders obtained by the BPI in October 2013 resulted in the blocking of 21 file-sharing sites including FilesTube and Torrentz. There is a private agreement in principle between leading ISPs and rights holders, made with encouragement from government, to quickly restrict access to websites when presented with court orders. The court orders are not made public and "overblocking" is sometimes reported, such as the accidental blocking of the Radio Times, Crystal Palace F.C., Taylor Swift and over 100 others websites in August 2013.
The practice originated as a result of a court order applied against an incidence of copyright infringement was that taken out by the Motion Picture Association in December 2010 at the request of Hollywood studios. The Association applied for an injunction to block access to NewzBin2, a site which provided a search service for UseNet content, indexing downloads of copyrighted content including movies and other pirated material. The application was lodged against BT, the largest Internet service provider in the United Kingdom with around six million customers. It required BT to use Cleanfeed to block its customers' access to the site. In July 2011 the High Court of Justice granted the injunction and in October 2011 BT was ordered to block access to the website within fourteen days, the first ruling of its kind under UK copyright law. The precedent set was described by the Open Rights Group as "dangerous". BT did not appeal against the ruling and put the required block in place on 2 November 2011. Subsequent attempts to access the site from a BT IP address were met with the message "Error - site blocked". Newzbin released client software to circumvent the BT blocking, using encryption and the Tor network. Newzbin claimed that over 90% of its active UK users had downloaded its workaround software making the BT block ineffective. However, further court orders resulted in Sky blocking access to Newzbin in December 2011 and Virgin Media blocking access to the site in August 2012. On 28 November 2012 Newzbin announced the closure of its indexing service.
Meanwhile in May 2012 the High Court ordered the blocking of The Pirate Bay by UK ISPs to prevent further copyright infringing movie and music downloads from the website. The blocks were said to be quickly bypassed and a spokesman for The Pirate Party said public interest in the service following the ban had boosted traffic to the party's website. In December 2012, the British Phonographic Industry (BPI) threatened legal action against The Pirate Party after the party refused demands sent at the end of November to remove their proxy to The Pirate Bay.
In September 2013 an Ofcom survey revealed that 2% of Internet users are responsible for 74% of all copyright-infringing downloads in the UK, and that 29% of all downloads are of content which violates copyright.
ISP Default network blocking
Since the end of 2013, new Internet customers in the UK have had their Internet access filtered at the ISP level so that selected web sites are blocked by default. An ongoing program is being introduced to extend default blocking of prohibited content by ISPs to existing users. A voluntary code of practice agreed by all four major ISPs means that customers have to 'opt out' of the ISP filtering to gain access to the blocked content. However users cannot usually opt-out of the monitoring and re-routing of the traffic through likely exploitable equipment due to the complex nature of the active monitoring systems. The range of content blocked by ISPs can be increased over time.
The idea for default filtering originated in manifesto commitments by the 2010 coalition government partners concerning "the commercialisation and sexualisation of childhood". This was followed by a review (the Bailey Review) and a consultation by UKCCIS. By 2013 there had already been considerable adoption of in-home filtering, with 43% of homes with children aged 5–15 having filters installed on their family computer. Nevertheless, Prime Minister David Cameron made it clear in July 2013 that his aim was to ensure that by the end of 2013 all ISPs would have a filtering system in place. As a result all four major ISPs (TalkTalk, Sky and BT) began applying default filtering to new customers in 2013 with Virgin doing so in February 2014. Default filtering of existing customers will be implemented by all four major ISPs during 2014 with the aim of ensuring that the system applies to 95% of all households by the end of the year.
TalkTalk already had content-control software available to comply with government requirements. Their HomeSafe internet filtering system was introduced in May 2011 as an opt-in product and was used for default filtering of new customers from March 2012. HomeSafe was praised by Cameron and is controlled and operated by the Chinese company Huawei. Other ISPs had to commission new filtering systems to fulfil Government demands. Some smaller ISPs expressed their reluctance to take part in filtering, citing concerns over costs and civil liberties but the government stated: "We expect the smaller ISPs to follow the lead being set by the larger providers". Cameron said ISPs should choose their own preferred technical solution, but would be monitored to ensure filtering was done correctly.
In July 2014 Ofcom released their report into the filter implementations and effectiveness across the fixed line ISPs. At that point take-up figures were low for BT (5%), Sky (8%) and Virgin (4%).
Although these arrangements are voluntary, legislation to enforce them has not been ruled out. In fact, Cameron announced such legislation in July 2013. However, default filtering was rejected at the September 2013 conference of the Liberal Democrats (the Coalition Government's minor partner) making Government legislation unlikely before the next UK General Election in 2015. A private members bill requiring ISPs, mobile phone operators and equipment manufacturers to filter adult content was introduced into the House of Lords in May 2012 by Baroness Howe of Idlicote. The Online Safety Bill has been criticised for its potential to block any service that appears to provide adult material unless it is on an Ofcom-approved list. Although the bill is unlikely to succeed due to a lack of Government support, its measures may appear in a future Government Communications Bill. The opposition Labour Party has stated that, if elected in 2015, it will legislate to introduce mandatory filters based on BBFC ratings if it believes that voluntary filtering by ISPs has failed.
The Washington Post described the UK's ISP filtering systems as creating "some of the strictest curbs on pornography in the Western world". There is no public scrutiny of the filtering lists. This creates the potential for them to be expanded to stifle dissent for political ends, as has happened in some other countries. Cameron has insisted that Internet users will have the option to turn the filters off, but no legislation exists to ensure that option will remain available.
After filtering was introduced at the end of 2013 there was widescale criticism of inadvertent 'overblocking'. Legitimate sites are regularly blocked by the filters of some UK ISPs and mobile operators. Furthermore, the identification of overblocked sites is made more difficult by the fact that ISPs do not provide checking tools to allow website owners to determine whether their site is being blocked. When the Open Rights Group launched their independent checking tool in July 2014 it was discovered that 19% of 100,000 popularly-visited websites were being blocked (with significant variation between ISPs) although the percentage of sites hosting legal pornographic material is thought to be around 4%.
Examples of overblocked categories reported include:
- sex education and advice on sexual health
- help with sex and pornography addiction
- support services for rape and domestic abuse
- child protection services
- suicide prevention
- parliament, government and politicians
- drug advice
New Statesman magazine observed that such overblocking means “the most vulnerable people in society are the most likely to be cut off from the help they need”. In December 2013 the UK Council for Child Internet Safety met with ISPs, charities, representatives from government, the BBFC and mobile phone operators to seek ways to reduce the blocking of educational advice for young people. In January 2014 UKCCIS began constructing a whitelist of the charity-run educational sites for children that had been overblocked. The intention is to provide the list to ISPs to allow unblocking.
Significant underblocking has also been discovered, with ISPs failing to block up to 7% of adult sites tested. A study commissioned by the European Commission's Safer Internet Programme which tested parental control tools showed that underblocking for adult content ranged from 5-35%.
Proponents of internet filtering are in favor of it primarily to combat the early sexualisation of children. The government believes that "broadband providers should consider automatically blocking sex sites, with individuals being required to opt in to receive them, rather than opt out and use the available computer parental controls." In 2010 communications minister Ed Vaizey was quoted as saying, "This is a very serious matter. I think it is very important that it's the ISPs that come up with solutions to protect children."
In March 2014, president Diane Duke of the United States based Free Speech Coalition argued against the censorship rules at a London conference sponsored by Virgin Media. The discussion was titled "Switched on Families: Does the Online World Make Good Things Happen?". The panel included government representatives such as Member of Parliament Claire Perry, members of the press, and supporters of an open Internet such representatives from the UK Council for Child Internet Safety, the Family Online Safety Institute, and Big Brother Watch. A report on the meeting was printed in The Guardian on Wednesday, March 5. Duke was quoted as saying, "The filters Prime Minister Cameron supports block sexual health sites, they block domestic violence sites, they block gay and lesbian sites, they block information about eating disorders and a lot of information to which it's crucial young people have access. Rather than protect children from things like bullying and online predators, these filters leave children in the dark."
In July 2013 an Open Rights Group consultation indicated that a number of content categories would be blocked. However of these, no indication of blocking of either 'anorexia and eating disorder websites' or 'esoteric material' has been detected.
|Category||TalkTalk Homesafe||BT Family Protection||Sky Broadband Shield||Virgin Media Web Safe|
|Dating||(Default) Dating||(Light) Dating||(13) Dating||Possibly not due to dating.virginmedia.com|
|Drugs||(Default) Drugs, Alcohol and Tobacco||(Light) Drugs||(13) Drugs and Criminal Skills||Drugs|
|Alcohol and Tobacco||(Default) Drugs, Alcohol and Tobacco||(Light) Alcohol & Tobacco|
|File sharing||File Sharing Sites||(Strict) File Sharing||(13) Anonymizers, Filesharing and Hacking|
|Gambling||(Default) Gambling||(Moderate) Gambling||Not blocked due to Sky Betting and Gaming division||Probably not blocked due to Virgin Gaming division|
|(PG) Online Gaming|
|Pornography||(Default) Pornography||(Light) Pornography||(13) Pornography and Adult||Pornography|
|Social networking and Web forums||Social Networking
|(Moderate) Social Networking
|(PG) Social Networking||Not blocked|
|Suicide and Self-harm||(Default) Suicide and Self Harm||(Light) Hate and Self-harm||(13) Suicide and Self Harm||Self-harm and Suicide|
|Weapons and violence||(Default) Weapons and Violence||(Moderate) Weapons and Violence||(13) Weapons, Violence, Gore and Hate||Violence|
|Obscenity||(Light) Obscene and Tasteless|
|Criminal Skills||(Light) Obscene and Tasteless||(13) Drugs and Criminal Skills||Crime|
|Hate||(Light) Hate and Self-harm||(13) Weapons, Violence, Gore and Hate||Hate|
|Media Streaming||(Strict) Media Streaming|
|Fashion and Beauty||(Strict) Fashion and Beauty|
|Gore||(Light) Obscene and Tasteless||(13) Weapons, Violence, Gore and Hate|
|Cyberbullying||Not blocked||No||(13) Cyber Bullying|
|Hacking||(Light) Obscene and Tasteless||(13) Anonymizers, Filesharing and Hacking||Hacking|
|School Cheating Sites||(Custom) Homework Time|
Gay and Lesbian Lifestyle
|(Custom) Sex Education|
|Search Engines||(Custom) Search Engines and Portals|
|(Optional) Phishing, Malware and Spyware||Virus Alerts||(18) Phishing, Malware and Spyware|
|Web-blocking circumvention tools||When any filtering enabled||(13) Anonymizers, Filesharing and Hacking|
Mobile Internet Blocking
UK mobile phone operators began filtering Internet content in 2004 when Ofcom published a "UK code of practice for the self-regulation of new forms of content on mobiles". This provided a means of classifying mobile Internet content to enable consistency in filtering. All major UK operators now voluntarily filter content by default and when users try to access blocked content they are redirected to a warning page. This tells them that they are not able to access an 'over 18 status' Internet site and a filtering mechanism has restricted their access. Categories that are listed as blocked include: adult / sexually explicit, chat, criminal skills, drugs, alcohol and tobacco, gambling, hacking, hate, personal and dating, violence, and weapons. Users who are adults may have the block lifted on request.
Guidelines published by the Independent Mobile Classification Body were used by mobile operators to classify sites until the British Board of Film Classification took over responsibility in 2013. Classification determines whether content is suitable for customers under 18 years old. The default assumption is that a user is under 18.
The following content types must be blocked from under 18's:
- Suicide, Self-harm, Pro-Anorexia and Eating disorders
- Discriminatory language
- Encouragement of Drug Use
- Repeated / aggressive use of ‘cunt’
- Pornography Restrictions
- Violence and Gore restrictions
Significant overblocking of Internet sites by mobile operators is reported, including the blocking of political satire, feminism and gay content. Research by the Open Rights Group highlighted the widespread nature of unjustified site blocking. In 2011 the group set up Blocked.org.uk, a website allowing the reporting of sites and services that are 'blocked' on their mobile network. The website received hundreds of reports of the blocking of sites covering blogs, business, internet privacy and internet forums across multiple networks. The Open Rights Group also demonstrated that correcting the erroneous blocking of innocent sites can be difficult. No UK mobile operator provides an on-line tool for identifying blocked websites. The O2 Website status checker was available until the end of 2013 but was suspended in December after it had been widely used to determine the extent of overblocking by O2. Not only were civil liberties and computing sites being blocked, but also Childline, the NSPCC, the Police. An additional opt-in whitelist service aimed at users under 12 years is provided by O2. The service only allows access to websites on a list of categories deemed suitable for that age group.
Internet Watch Foundation
Between 2004 and 2006, BT Group introduced its Cleanfeed content blocking system technology. 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. Cleanfeed is a silent content filtering system, which means that Internet users cannot ascertain whether they are being regulated by Cleanfeed, experiencing connection failures, or if the page really does not exist. The proportion of Internet Service Providers using Cleanfeed by the beginning of 2006 was 80% and this rose to 95% by the middle of 2008. In February 2009, the Government said that it was looking at ways to cover the final 5%.
According to a small-sample survey conducted in 2008 by Nikolaos Koumartzis, an MA researcher at London College of Communication, the vast majority of UK based Internet users (90.21%) were unaware of the existence of Cleanfeed software. Moreover, nearly two thirds of the participants did not trust British Telecommunications or the IWF to be responsible for a silent censorship system in the UK. A majority would prefer to see a message stating that a given site was blocked and to have access to a form for unblocking a given site.
Cleanfeed originally targeted only alleged child sexual abuse content identified by the Internet Watch Foundation. However, no safeguards exist to stop the secret list of blocked sites being extended to include sites unrelated to child pornography. This had led to criticism of Cleanfeed's lack of transparency which gives it considerable potential for broad censorship. Further, Cleanfeed has been used to block access to copyright-infringing websites after a court order in 2011 required BT to block access to NewzBin2. This has led some to describe Cleanfeed as the most perfectly invisible censorship mechanism ever invented and to liken its powers of censorship to those employed currently by China. There are risks that increasing Internet regulation will lead the Internet to be even more restricted in the future.
On 5 December 2008 the IWF system blacklisted a Wikipedia article on the Scorpions album Virgin Killer. A statement by the organisation's spokesman alleged that the album cover, displayed in the article, contained "a potentially illegal indecent image of a child under the age of 18". Users of major ISPs, including Virgin Media, Be/O2/Telefónica, EasyNet/UK Online, Demon and Opal, were unable to access the content, despite the album cover being available unfiltered on other major sites including Amazon.co.uk, and available for sale in the UK. The system also started proxying users, who accessed any Wikipedia article, via a minimal number of servers, which resulted in site administrators having to block them from editing Wikipedia or creating accounts. On 9 December, the IWF removed the article from its blacklist, stating: "IWF's overriding objective is to minimise the availability of indecent images of children on the Internet, however, on this occasion our efforts have had the opposite effect."
The vast majority of the Internet access provided by Wi-Fi systems in public places in the UK is filtered with many sites being blocked. The filtering is done voluntarily by the six largest providers of public Wi-Fi: Arqiva, BT, Sky, Nomad Digital, Virgin and O2, who together are responsible for 90% public Wi-Fi. The filtering was introduced as a result of an agreement put in place in November 2013 between the Government and the Wi-Fi providers. Pressure from the Government and the UK Council for Child Internet Safety had already led Virgin and O2 to install filtering on the Wi-Fi systems on the London Underground and McDonald's restaurants, but half of all public Wi-Fi networks remained unfiltered in September 2013.
"Overblocking" is a problem reported with public Wi-Fi filters. Research in September 2013 indicated that poorly-programmed filters blocked sites when a prohibited tag appeared coincidentally within an unrelated word. Religious sites were blocked by nearly half of public Wi-Fi filters and sex education sites were blocked by one third. In November 2013, there were complaints about the blocking of Gay websites that were not related to sex or nudity on the public Wi-Fi provided by train operating companies. The filtering was done by third party organisations and these were criticised for being both unidentified and unaccountable. Such blocking may breach the Equality Act 2010. The government arranged for the UK Council for Child Internet Safety to investigate whether filters were blocking advice to young people in areas such as sex education.
Libraries and educational institutions
Many libraries in the UK such as the British Library and local authority public libraries apply filters to Internet access. Some public libraries block Payday loan websites and Lambeth Council has called for other public Wi-fi providers to block these sites too.
The majority of Schools and Colleges use filters to block access to sites which contain Adult material, Gambling and sites which contain malware.YouTube, Facebook and Twitter are often filtered by certain schools. Some universities also block access to sites containing a variety of material. Many students often use proxy servers to bypass this. Schools often censor pupils' Internet access in order to offer some protection against various perceived threats such as cyber-bullying and the perceived risk of grooming by pedophiles; as well as to maintain pupil attention during IT lessons. Examples of overblocking exist in the school context. For instance, in February 2014 the website of the Yes Scotland pro-independence campaign was blocked in a Glasgow school while the rival Better Together pro-union website was not blocked.
The Counter Terrorism Internet Referral Unit, which was set up in 2010 by the Association of Chief Police Officers and run by the Metropolitan Police Service, issues removal requests for Internet content hosted in the UK that in their opinion incites or glorifies terrorist acts under Section 3 of the Terrorism Act 2006.
The December 2013 report of the Prime Minister's Extremism task force proposed that where such material is hosted overseas, ISPs should block the websites. This approach has been criticised for being extra-parliamentary and extrajudicial and for being a proactive process where authorities actively seek out material to ban. Additionally, concerns have been expressed by ISPs and freedom of speech advocates that these measures could lead to the censorship of content that is “extremist” but not illegal. Indeed, the United Kingdom security minister James Brokenshire said in March 2014 that the government should also deal with material "that may not be illegal but certainly is unsavoury and may not be the sort of material that people would want to see or receive".
The CTIRU's provides its block list of sites and content provided to the public estate institutions. David Cameron has ordered this list be extended to UK ISPs through a body similar to the Internet Watch Foundation
A service provider will integrate some or all its feeds into a single filtering device or stack, sometimes in conjunction with an upstream provider performing additional filtering. The following content-control technologies have been confirmed to be used to implement all types of web blocking (includes virtual operators):
|BT||Broadband and Infinity||Cleanfeed||Nominum|
|BT Wifi Protect||Symantec Rulespace|
|BSkyB||The Cloud Public Wifi||Sonicwall|
|Sky Broadband||Hawkeye||Symantec Rulespace via Xerocole|
|Arbor traffic management system||Symantec Rulespace|
|Hutchison 3G||3 Mobile|
|Nomad Digital||Public transport Wifi|
|TalkTalk Group||TalkTalk Broadband||Service Inspection Gateway (SIG)||Huawei|
|Telefónica UK||O2 Broadband and Mobile||StreamShield by Detica||Symantec Rulespace|
|Virgin Media||Virgin Media Broadband||Web Blocker 2||Nominum|
|Virgin Media and EE||London Underground Wifi||Nominum|
|Vodaphone Mobile||Vodaphone Mobile||Symantec Rulespace|
Rulespace is the only known service with a public checker tool
By Feed Type
|Corporate Filtering (most possible)||SSL enabled Deep packet inspection with URI Blocking
IP address blocking
|Child abuse image content list
Extremist material blocking (proposed)
|Deep packet inspection with URI Blocking
IP address blocking
|Technical threat blocking||Database built via deep packet inspection
IP address blocking
|Default ISP Filters
Mobile Internet Filtering
Wifi Hotspot Filtering
Library and educational filtering
Deep packet inspection with URI Blocking
|Copyright infringement site blocking||IP address blocking
Internet Service Providers
The Internet Service Provider Andrews and Arnold does not censor any of its internet connection all it's broadband packages guarantee a 12 month notice should it start to censor any of its traffic.
Open Rights Group
The Open Rights Group has been highly critical of the blocking programmes, especially mobile blocking and ISP default blocking. In July 2014 they launched blocked.org.uk, a revamp of their mobile blocking site to report details of blocking on different fixed line ISPs.
Child abuse image content list
Due to the proxy server implementation of the IWF's child abuse image content list (formally Cleanfeed) system, websites that filter users by IP address, such as wikis and file lockers, will be significantly broken, even if only a tiny proportion of its content is flagged.
In response to the increasing number of file sharing related blocks, a number of proxy aggregator sites, e.g. torrentproxies.com, have become popular. In addition to the following, proxy sites designed to circumvent blocks have been secretly blocked by ISPs, driving users to proxy comparison sites. The Pirate Bay created a version of Tor branded as the PirateBrowser specifically to encourage anonymity and circumvention of these blocks.
ISP Default network blocking
- Cleanfeed (content blocking system)
- Content-control software
- Internet censorship
- Internet censorship in the United Kingdom
- List of content-control software
- Websites blocked in the United Kingdom
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