90 lines
5.2 KiB
HTML
90 lines
5.2 KiB
HTML
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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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