article on ads.txt/app-ads.txt placeholder record
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Daniel Micay
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<ul>
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<li><a href="/articles/server-traffic-shaping">Server traffic shaping</a></li>
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<li><a href="/articles/sitewide-advertising-industry-opt-out">Sitewide advertising industry opt-out</a></li>
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</ul>
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</main>
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<footer>
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static/articles/sitewide-advertising-industry-opt-out.html
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static/articles/sitewide-advertising-industry-opt-out.html
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<!DOCTYPE html>
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<html lang="en" prefix="og: https://ogp.me/ns#">
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<head>
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<meta charset="utf-8"/>
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<title>Sitewide advertising opt-out | Articles | GrapheneOS</title>
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<meta name="description" content="Using ads.txt / app-ads.txt to disallow buying or selling ads for a domain."/>
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<meta name="theme-color" content="#212121"/>
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<meta name="msapplication-TileColor" content="#ffffff"/>
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<meta name="viewport" content="width=device-width, initial-scale=1"/>
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<meta name="twitter:site" content="@GrapheneOS"/>
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<meta name="twitter:creator" content="@GrapheneOS"/>
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<meta property="og:title" content="Sitewide advertising industry opt-out"/>
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<meta property="og:description" content="Using ads.txt / app-ads.txt to disallow buying or selling ads for a domain."/>
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<meta property="og:type" content="website"/>
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<meta property="og:image" content="https://grapheneos.org/opengraph.png"/>
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<meta property="og:image:width" content="512"/>
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<meta property="og:image:height" content="512"/>
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<meta property="og:image:alt" content="GrapheneOS logo"/>
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<meta property="og:url" content="https://grapheneos.org/articles/sitewide-advertising-industry-opt-out"/>
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<meta property="og:site_name" content="GrapheneOS"/>
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<link rel="icon" sizes="16x16 24x24 32x32 48x48 64x64" type="image/vnd.microsoft.icon" href="/favicon.ico"/>
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<link rel="icon" sizes="any" type="image/svg+xml" href="/mask-icon.svg"/>
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<link rel="mask-icon" href="/mask-icon.svg" color="#1a1a1a"/>
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<link rel="apple-touch-icon" href="/apple-touch-icon.png"/>
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<link rel="stylesheet" href="/grapheneos.css?29"/>
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<link rel="manifest" href="/manifest.webmanifest"/>
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<link rel="canonical" href="https://grapheneos.org/articles/sitewide-advertising-industry-opt-out"/>
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<link rel="license" href="/LICENSE.txt"/>
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</head>
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<body>
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<header>
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<nav id="site-menu">
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<ul>
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<li><a href="/">GrapheneOS</a></li>
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<li><a href="/features">Features</a></li>
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<li><a href="/install">Install</a></li>
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<li><a href="/usage">Usage</a></li>
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<li><a href="/faq">FAQ</a></li>
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<li><a href="/releases">Releases</a></li>
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<li><a href="/source">Source</a></li>
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<li><a href="/articles/">Articles</a></li>
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<li><a href="/donate">Donate</a></li>
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<li><a href="/contact">Contact</a></li>
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</ul>
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</nav>
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</header>
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<main id="sitewide-advertising-industry-opt-out">
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<h1><a href="#sitewide-advertising-industry-opt-out">Sitewide advertising industry opt-out</a></h1>
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<p>The <a href="https://iabtechlab.com/wp-content/uploads/2020/12/ads-txt-v1.0.3_Draft_in_Public_Comment_IABTechLab_2020-12.pdf">ads.txt specification</a>
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provides a way to list the authorized sellers of ads for a domain. The
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<a href="https://iabtechlab.com/wp-content/uploads/2019/03/app-ads.txt-v1.0-final-.pdf">app-ads.txt specification</a>
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extends this to cover apps tied to the domain. As a domain owner, this is a valuable
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way to crack down on fraudulent usage of your domain including by adware.</p>
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<p>For domains without any third party advertising including those without any ads at
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all, you should serve both <code>/ads.txt</code> and <code>/app-ads.txt</code> from a
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web server with the placeholder record defined by the specification:</p>
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<pre>placeholder.example.com, placeholder, DIRECT, placeholder</pre>
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<p>The placeholder record formally disallows buying and selling ads on behalf of the
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domain including for any subdomains. This prevents fradulently buying / selling ads
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for your domain anywhere that ads.txt / app-ads.txt are enforced.</p>
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<p>It's in the interest of most ad tech companies to enforce these standards due to
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losses from ad fraud so adoption is increasingly widespread.</p>
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<p>Browser extension malware injecting ads into sites is very common and this is a way
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for sites to hurt those malware developers where it hurts: their pocketbook.</p>
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<p>These standards have a limited scope and were primarily created to address the cost
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of ad fraud for the advertising industry, but they do offer value for domain owners to
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protect their reputation and discourage adware.</p>
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</main>
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<footer>
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<a href="/"><img src="/logo.png" width="512" height="512" alt=""/>GrapheneOS</a>
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<ul id="social">
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<li><a href="https://twitter.com/GrapheneOS">Twitter</a></li>
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<li><a href="https://github.com/GrapheneOS">GitHub</a></li>
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<li><a href="https://reddit.com/r/GrapheneOS">Reddit</a></li>
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<li><a href="https://www.linkedin.com/company/grapheneos/">LinkedIn</a></li>
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</ul>
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</footer>
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</body>
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</html>
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