Individuals and organizations may engage in self-censorship of material they publish, for moral, religious, or business reasons, to conform to societal norms, political views, due to intimidation, or out of fear of legal or other consequences.
Other types of censorship include the use of copyrights, defamation, harassment, and various obscene material claims as a way to deliberately suppress content.
Perception of internet censorship in the US is largely based on the First Amendment and the right for expansive free speech and access to content without regard to the consequences.
Pseudonymity and data havens (such as Hyphanet) protect free speech using technologies that guarantee material cannot be removed and prevents the identification of authors.
Nevertheless, blocking remains an effective means of limiting access to sensitive information for most users when censors, such as those in China, are able to devote significant resources to building and maintaining a comprehensive censorship system.
Lists are populated from different sources, ranging from private supplier through courts to specialized government agencies (Ministry of Industry and Information Technology of China, Islamic Guidance in Iran).
[14] Enforcement of the censor-nominated technologies can be applied at various levels of countries and Internet infrastructure:[13] Internet content is subject to technical censorship methods, including:[3][6] Technical censorship techniques are subject to both over- and under-blocking since it is often impossible to always block exactly the targeted content without blocking other permissible material or allowing some access to targeted material and so providing more or less protection than desired.
[20] Writing in 2009, Ronald Deibert, professor of political science at the University of Toronto and co-founder and one of the principal investigators of the OpenNet Initiative, and, writing in 2011, Evgeny Morzov, a visiting scholar at Stanford University and an op-ed contributor to The New York Times, explain that companies in the United States, Finland, France, Germany, Britain, Canada, and South Africa are in part responsible for the increasing sophistication of online content filtering worldwide.
While the off-the-shelf filtering software sold by Internet security companies are primarily marketed to businesses and individuals seeking to protect themselves and their employees and families, they are also used by governments to block what they consider sensitive content.
[27] In a U.S. lawsuit filed in May 2011, Cisco is accused of helping the Chinese government build a firewall, known widely as the Golden Shield, to censor the Internet and keep tabs on dissidents.
[29] Many filtering programs allow blocking to be configured based on dozens of categories and sub-categories such as these from Websense: "abortion" (pro-life, pro-choice), "adult material" (adult content, lingerie and swimsuit, nudity, sex, sex education), "advocacy groups" (sites that promote change or reform in public policy, public opinion, social practice, economic activities, and relationships), "drugs" (abused drugs, marijuana, prescribed medications, supplements and unregulated compounds), "religion" (non-traditional religions occult and folklore, traditional religions), ....[25] The blocking categories used by the filtering programs may contain errors leading to the unintended blocking of websites.
Vendors often consider information about what sites and content is blocked valuable intellectual property that is not made available outside the company, sometimes not even to the organizations purchasing the filters.
[6] Different techniques and resources are used to bypass Internet censorship, including proxy websites, virtual private networks, sneakernets, the dark web and circumvention software tools.
[3][49] In June 2011, The New York Times reported that the U.S. is engaged in a "global effort to deploy 'shadow' Internet and mobile phone systems that dissidents can use to undermine repressive governments that seek to silence them by censoring or shutting down telecommunications networks.
Internet filtering related to threats to national security that targets the Web sites of insurgents, extremists, and terrorists often enjoys wide public support.
[11] Anti-copyright activists Christian Engström, Rick Falkvinge and Oscar Swartz have alleged that censorship of child pornography is being used as a pretext by copyright lobby organizations to get politicians to implement similar site blocking legislation against copyright-related piracy.
[65] Examples include: Blocking the intermediate tools and applications of the Internet that can be used to assist users in accessing and sharing sensitive material is common in many countries.
In May 2014, the European Court of Justice ruled against Google in Costeja, a case brought by a Spanish man who requested the removal of a link to a digitized 1998 article in La Vanguardia newspaper about an auction for his foreclosed home, for a debt that he had subsequently paid.
The court ruled in Costeja that search engines are responsible for the content they point to and thus, Google was required to comply with EU data privacy laws.
Although the ruling is intended for private individuals it opens the door to anyone who wants to whitewash their personal history....The Court's decision is a retrograde move that misunderstands the role and responsibility of search engines and the wider internet.
[81] The government requires Internet search firms and state media to censor issues deemed officially "sensitive," and blocks access to foreign websites including Facebook, Twitter, and YouTube.
The case created a problematic precedent that the Internet may become subject to regulation under the strictest national defamation laws, and would limit free speech that may be acceptable in other countries.
[87] This full block was implemented without cutting off major intercontinental fibre-optic links, with Renesys stating on 27 January, "Critical European-Asian fiber-optic routes through Egypt appear to be unaffected for now.
[95] Other country-wide shutdowns in 2019 include Zimbabwe after a gasoline price protests triggered police violence, Gabon during the 2019 Gabonese coup attempt, and during or after elections in Democratic Republic of the Congo, Benin, Malawi, and Kazakhstan.
[97][98] Some countries have used localized Internet shutdowns to combat cheating during exams, including Iraq,[99] Ethiopia, India, Algeria, and Uzbekistan.
The year's largest improvement was recorded in India, where restrictions to content and access were relaxed from what had been imposed in 2013 to stifle rioting in the northeastern states.
Notable improvement was also recorded in Brazil, where lawmakers approved the bill Marco Civil da Internet, which contains significant provisions governing net neutrality and safeguarding privacy protection.
[125] Unlike Freedom House or V-Dem, Access Now detects shutdowns using remote sensing and then confirms these instances with reports from civil society, government, in-country volunteers, or ISPs.
[132] This successful use of digital media in turn led to increased censorship including the complete loss of Internet access for periods of time in Egypt[87][88][133] and Libya in 2011.
Facebook was noted as being suspended due to an objection to its policy of reviewing news stories for authenticity where they were produced by Russian state-backed media before allowing them to be published on its platform.