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Do Not Track - Wikipedia
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data-file-height="512" /></a></span></div></div> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">HTTP header field</div> <p class="mw-empty-elt"> </p><p><b>Do Not Track</b> (<b>DNT</b>) is a formerly official <a href="/wiki/List_of_HTTP_header_fields" title="List of HTTP header fields">HTTP header field</a>, designed to allow internet users to opt out of <a href="/wiki/Web_tracking" title="Web tracking">tracking by websites</a>—which includes the collection of data regarding a user's activity across multiple distinct contexts, and the retention, use, or sharing of data derived from that activity outside the context in which it occurred.<sup id="cite_ref-Corbin-2010_1-0" class="reference"><a href="#cite_note-Corbin-2010-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>The Do Not Track header was originally proposed in 2009 by researchers Christopher Soghoian and Sid Stamm.<sup id="cite_ref-Fleishman-2024_2-0" class="reference"><a href="#cite_note-Fleishman-2024-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Mozilla Firefox became the first browser to implement the feature. The header failed to find widespread success due to the lack of legislation requiring companies to legally respect the Do Not Track header; and most companies and websites not respecting the header when sent by the user.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p><p>In 2020, a coalition of US-based internet companies announced the <b>Global Privacy Control</b> header that succeeds Do Not Track header. The creators hope that this new header will meet the definition of "user-enabled global privacy controls" defined by the California Consumer Privacy Act (CCPA) and the European General Data Protection Regulation (GDPR). In this case, the new header would be automatically strengthened by existing laws and companies would be required to honor it. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Operation">Operation</h2></div> <p>The DNT header accepts three values: <code>1</code> in case the user does not want to be tracked <i>(opt-out)</i>, <code>0</code> in case the user consents to be tracked <i>(opt-in)</i>, or <i>null</i> (no header sent) if the user has not expressed a preference. The default behavior required by the standard is not to send the header unless the user enables the setting via their browser or their choice is implied by the use of that specific browser.<sup id="cite_ref-DNT_4-0" class="reference"><a href="#cite_note-DNT-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="History">History</h2></div> <p>In 2007, several consumer advocacy groups asked the U.S. <a href="/wiki/Federal_Trade_Commission" title="Federal Trade Commission">Federal Trade Commission</a> (FTC) to create a Do Not Track list for online advertising. The proposal would have required that online advertisers submit their information to the FTC, which would compile a machine-readable list of the <a href="/wiki/Domain_name" title="Domain name">domain names</a> used by those companies to place cookies or otherwise track consumers.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p><p>In July 2009, researchers Christopher Soghoian and Sid Stamm implemented support for the Do Not Track header in the Firefox web browser via a prototype add-on. Stamm was, at the time, a privacy engineer at Mozilla, while Soghoian soon afterward started working at the FTC.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> One year later, during a U.S. Senate privacy hearing, FTC Chairman Jon Leibowitz told the Senate Commerce Committee that the commission was exploring the idea of proposing a "do-not-track" list.<sup id="cite_ref-Corbin-2010_1-1" class="reference"><a href="#cite_note-Corbin-2010-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>In December 2010, the FTC issued a privacy report that called for a "do-not-track" system that would enable people to avoid having their actions being monitored online.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p><p>One week later, Microsoft announced that its next browser would include support for Tracking Protection Lists that block tracking of consumers using blacklists supplied by third parties.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> In January 2011, Mozilla announced that its Firefox browser would soon provide a Do Not Track solution, via a browser header.<sup id="cite_ref-online_9-0" class="reference"><a href="#cite_note-online-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> Microsoft's <a href="/wiki/Internet_Explorer_9" title="Internet Explorer 9">Internet Explorer 9</a>,<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> Apple's Safari,<sup id="cite_ref-Nick_Wingfield_11-0" class="reference"><a href="#cite_note-Nick_Wingfield-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> Opera<sup id="cite_ref-Opera_12-0" class="reference"><a href="#cite_note-Opera-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> and Google Chrome<sup id="cite_ref-longerbattery_13-0" class="reference"><a href="#cite_note-longerbattery-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> all later added support for the header approach. </p><p>In August 2015 a coalition of privacy groups led by the Electronic Frontier Foundation using <a href="/wiki/World_Wide_Web_Consortium" title="World Wide Web Consortium">W3C</a>'s Tracking Preference Expression (DNT) standard proposed that "Do not track" be the goal for advocates to demand of businesses.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> </p><p>In January 2019, the W3C Tracking Protection Working Group was disbanded, citing "insufficient deployment of these extensions" and lack of "indications of planned support among user agents, third parties, and the ecosystem at large".<sup id="cite_ref-GitHub_note_W3C_DNT_disbanded_15-0" class="reference"><a href="#cite_note-GitHub_note_W3C_DNT_disbanded-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Gizmodo_Apple_Removing_Do_Not_Track_16-0" class="reference"><a href="#cite_note-Gizmodo_Apple_Removing_Do_Not_Track-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> Beginning the following month, Apple removed DNT support from Safari, citing that it could be used as a "<a href="/wiki/Browser_fingerprinting" class="mw-redirect" title="Browser fingerprinting">fingerprinting</a> variable" for tracking.<sup id="cite_ref-apple_fingerprinting_17-0" class="reference"><a href="#cite_note-apple_fingerprinting-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Internet_Explorer_10_default_setting_controversy">Internet Explorer 10 default setting controversy</h3></div> <p>When using the "Express" settings upon installation, a Do Not Track option is enabled by default for <a href="/wiki/Internet_Explorer_10" title="Internet Explorer 10">Internet Explorer 10</a> and <a href="/wiki/Windows_8" title="Windows 8">Windows 8</a>.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> Microsoft faced criticism for its decision to enable Do Not Track by default<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> from advertising companies, who say that use of the Do Not Track header should be a choice made by the user and must not be automatically enabled. The companies also said that this decision would violate the <a href="/wiki/Digital_Advertising_Alliance" class="mw-redirect" title="Digital Advertising Alliance">Digital Advertising Alliance</a>'s agreement with the U.S. government to honor a Do Not Track system, because the coalition said it would only honor such a system if it were not enabled by default by web browsers.<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> A Microsoft spokesperson defended its decision however, stating that users would prefer a web browser that automatically respected their privacy.<sup id="cite_ref-dig-msdnt_21-0" class="reference"><a href="#cite_note-dig-msdnt-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> </p><p>On September 7, 2012, <a href="/wiki/Roy_Fielding" title="Roy Fielding">Roy Fielding</a>, an author of the Do Not Track standard, <a href="/wiki/Commit_(version_control)" title="Commit (version control)">committed</a> a patch to the source code of the <a href="/wiki/Apache_HTTP_Server" title="Apache HTTP Server">Apache HTTP Server</a>, which would make the server explicitly ignore any use of the Do Not Track header by users of Internet Explorer 10. Fielding wrote that Microsoft's decision "deliberately violates" the Do Not Track specification because it "does not protect anyone's privacy unless the recipients believe it was set by a real human being, with a real preference for privacy over personalization". The Do Not Track specification did not explicitly mandate that the use of Do Not Track actually be a choice until after the feature was implemented in Internet Explorer 10.<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> According to Fielding, Microsoft knew its Do Not Track signals would be ignored, and that its goal was to effectively give an illusion of privacy while still catering to their own interests.<sup id="cite_ref-cnet-apachednt_23-0" class="reference"><a href="#cite_note-cnet-apachednt-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> On October 9, 2012, Fielding's patch was <a href="/wiki/Comment_(computer_programming)" title="Comment (computer programming)">commented out</a>, restoring the previous behavior.<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> </p><p>On April 3, 2015, Microsoft announced that starting with <a href="/wiki/Windows_10" title="Windows 10">Windows 10</a>, it would comply with the specification and no longer automatically enable Do Not Track as part of the operating system's "Express" default settings, but that the company will "provide customers with clear information on how to turn this feature on in the browser settings should they wish to do so".<sup id="cite_ref-cw-dntdisabledms_26-0" class="reference"><a href="#cite_note-cw-dntdisabledms-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Adoption">Adoption</h2></div> <p>Very few advertising companies actually supported DNT, due to a lack of regulatory or voluntary requirements for its use,<sup id="cite_ref-bi-gapingflaw_27-0" class="reference"><a href="#cite_note-bi-gapingflaw-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> and unclear standards over how websites should respond to the header. Websites that honor DNT requests include <a href="/wiki/Medium_(website)" title="Medium (website)">Medium</a> and <a href="/wiki/Pinterest" title="Pinterest">Pinterest</a>.<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> Despite offering the option in its Chrome web browser, <a href="/wiki/Google" title="Google">Google</a> did not implement support for DNT on its websites, and directed users to its online privacy settings and opt-outs for interest-based advertising instead.<sup id="cite_ref-gizmodo-doesntdoanything_29-0" class="reference"><a href="#cite_note-gizmodo-doesntdoanything-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> The <a href="/wiki/Digital_Advertising_Alliance" class="mw-redirect" title="Digital Advertising Alliance">Digital Advertising Alliance</a>, <a href="/wiki/Council_of_Better_Business_Bureaus" class="mw-redirect" title="Council of Better Business Bureaus">Council of Better Business Bureaus</a> and the <a href="/wiki/Data_%26_Marketing_Association" title="Data & Marketing Association">Data & Marketing Association</a> does not require its members to honor DNT signals.<sup id="cite_ref-DAA-position_30-0" class="reference"><a href="#cite_note-DAA-position-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> </p><p>Use of <a href="/wiki/Ad_blocking" title="Ad blocking">ad blocking</a> software to block web trackers and advertising has become increasingly common (with users citing both privacy concerns and performance impact as justification), while Apple and Mozilla began to add privacy enhancements (such as "tracking protection") to their browsers, that are designed to reduce undue cross-site tracking. In addition, laws such as the European Union's <a href="/wiki/General_Data_Protection_Regulation" title="General Data Protection Regulation">General Data Protection Regulation</a> (GDPR) have imposed restrictions on how companies are to store and process personal information.<sup id="cite_ref-gizmodo-doesntdoanything_29-1" class="reference"><a href="#cite_note-gizmodo-doesntdoanything-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Fleishman-2024_2-1" class="reference"><a href="#cite_note-Fleishman-2024-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p><p><a href="/wiki/Princeton_University" title="Princeton University">Princeton University</a> associate professor of computer science <a href="/wiki/Jonathan_Mayer" title="Jonathan Mayer">Jonathan Mayer</a>, who was a member of the W3C's working group for DNT, argued that the concept is a "failed experiment".<sup id="cite_ref-gizmodo-doesntdoanything_29-2" class="reference"><a href="#cite_note-gizmodo-doesntdoanything-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Global_Privacy_Control">Global Privacy Control</h2></div> <p><b>Global Privacy Control</b> (GPC) is a proposed <a href="/wiki/List_of_HTTP_header_fields" title="List of HTTP header fields">HTTP header field</a> and <a href="/wiki/Document_Object_Model" title="Document Object Model">DOM property</a> that can be used to inform websites of the user's wish to have their information not be sold or used by ad trackers.<sup id="cite_ref-31" class="reference"><a href="#cite_note-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> GPC was developed in 2020 by privacy technology researchers such as <a href="/wiki/Wesleyan_University" title="Wesleyan University">Wesleyan University</a> professor <a href="/w/index.php?title=Sebastian_Zimmeck&action=edit&redlink=1" class="new" title="Sebastian Zimmeck (page does not exist)">Sebastian Zimmeck</a> and former Chief Technologist of the <a href="/wiki/Federal_Trade_Commission" title="Federal Trade Commission">Federal Trade Commission</a> <a href="/wiki/Ashkan_Soltani" title="Ashkan Soltani">Ashkan Soltani</a>, as well as a group of privacy-focused companies including the <a href="/wiki/Electronic_Frontier_Foundation" title="Electronic Frontier Foundation">Electronic Frontier Foundation</a>, <a href="/wiki/Automattic" title="Automattic">Automattic</a> (owner of <a href="/wiki/Tumblr" title="Tumblr">Tumblr</a> and <a href="/wiki/WordPress" title="WordPress">WordPress</a>), and more.<sup id="cite_ref-32" class="reference"><a href="#cite_note-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> </p><p>The signal has been implemented by <a href="/wiki/DuckDuckGo" title="DuckDuckGo">DuckDuckGo</a>'s <a href="/wiki/DuckDuckGo_Private_Browser" title="DuckDuckGo Private Browser">private browser</a> and extension, <i><a href="/wiki/The_New_York_Times" title="The New York Times">The New York Times</a></i>, and privacy browser <a href="/wiki/Brave_(web_browser)" title="Brave (web browser)">Brave</a> and is supported by <a href="/wiki/Firefox" title="Firefox">Firefox</a> creator, <a href="/wiki/Mozilla" title="Mozilla">Mozilla</a><sup id="cite_ref-33" class="reference"><a href="#cite_note-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup> as well as the <a href="/wiki/Attorney_General_of_California" title="Attorney General of California">California Attorney General</a>.<sup id="cite_ref-State-of-California-Department-of-Justice-Office-of-the-Attorney-General-2018_34-0" class="reference"><a href="#cite_note-State-of-California-Department-of-Justice-Office-of-the-Attorney-General-2018-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> Notably, <a href="/wiki/Google_Chrome" title="Google Chrome">Google Chrome</a> has not yet implemented the signal,<sup id="cite_ref-35" class="reference"><a href="#cite_note-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup> despite still allowing users to enable the now depreciated Do Not Track header.<sup id="cite_ref-36" class="reference"><a href="#cite_note-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup> However, there are third-party extensions available for Chrome if users want to send the GPC header with their requests, including the <a href="/wiki/Privacy_Badger" title="Privacy Badger">Privacy Badger</a> extension by <a href="/wiki/Electronic_Frontier_Foundation" title="Electronic Frontier Foundation">The Electronic Frontier Foundation</a>,<sup id="cite_ref-37" class="reference"><a href="#cite_note-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> the <a href="/wiki/DuckDuckGo" title="DuckDuckGo">DuckDuckGo</a> Privacy Essentials add-on,<sup id="cite_ref-38" class="reference"><a href="#cite_note-38"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup> and more. </p><p>One key difference between the Do Not Track header and GPC is that GPC is a valid do-not-sell-my-personal-information signal according to the <a href="/wiki/California_Consumer_Privacy_Act" title="California Consumer Privacy Act">California Consumer Privacy Act</a> (CCPA), which stipulates that websites are legally required to respect a signal sent by users who want to opt-out of having their personal data sold.<sup id="cite_ref-State-of-California-Department-of-Justice-Office-of-the-Attorney-General-2018_34-1" class="reference"><a href="#cite_note-State-of-California-Department-of-Justice-Office-of-the-Attorney-General-2018-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> In July 2021, the <a href="/wiki/Attorney_General_of_California" title="Attorney General of California">California Attorney General</a> clarified through an FAQ that under law, the Global Privacy Control signal must be honored.<sup id="cite_ref-State-of-California-Department-of-Justice-Office-of-the-Attorney-General-2018_34-2" class="reference"><a href="#cite_note-State-of-California-Department-of-Justice-Office-of-the-Attorney-General-2018-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> </p><p>On August 24, 2022, the <a href="/wiki/Attorney_General_of_California" title="Attorney General of California">California Attorney General</a> announced <a href="/wiki/Sephora" title="Sephora">Sephora</a> paid a $1.2-million settlement for allegedly failing to process opt-out requests via a user-enabled global privacy control signal.<sup id="cite_ref-39" class="reference"><a href="#cite_note-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div> <ul><li><a href="/wiki/Blur_(browser_extension)" class="mw-redirect" title="Blur (browser extension)">Blur (browser extension)</a></li> <li><a href="/wiki/P3P" title="P3P">P3P</a></li> <li><a href="/wiki/Evil_bit" title="Evil bit">Evil bit</a></li> <li><a href="/wiki/List_of_HTTP_header_fields#Common_non-standard_request_headers" title="List of HTTP header fields">List of HTTP header fields § Common non-standard request headers</a></li> <li>HTTP cookie §§ <a href="/wiki/HTTP_cookie#Privacy" title="HTTP cookie">Privacy</a>​ and <a href="/wiki/HTTP_cookie#Third-party_cookie" title="HTTP cookie">Third-party cookie</a></li> <li><a href="/wiki/Better_Business_Bureau" title="Better Business Bureau">Better Business Bureau</a></li> <li><a href="/wiki/Data_%26_Marketing_Association" title="Data & Marketing Association">Data & Marketing 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