Authorized inventory

You must not:

place Google-served ads on a domain that uses ads.txt where you are not included as an authorized seller of the inventory in the ads.txt file.

For syndication partners, Parents must ensure Children promptly add an ads.txt file to Child domains with Parents as authorized sellers of Child Inventory.

Tips for understanding this policy

Authorized Inventory | Google Publisher Policies

Publishers should use ads.txt files on their domains, and must ensure that they are included as authorized sellers of that inventory. For more information, refer to declare who is authorized to sell your inventory with ads.txt.
The ads.txt file can help buyers identify counterfeit inventory and help you receive more advertiser spend that might have otherwise gone toward that counterfeit inventory.

Learn more about the commonly used policy terms and what they mean in the glossary.

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