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Here are the "plain English" guidelines:
— Any servers that want to use the Mastodon name and logo in their branding (not domain!) should seek express written permission from Mastodon, which is granted on a case-by-case basis.
— The word Mastodon should never be used in the main part of a server’s domain (a subdomain is allowed).** We will not retroactively enforce this on **servers created before May 13, 2026.**
— Existing servers using the Mastodon name in their domain must include this disclaimer: “This [server/site] is not affiliated with or endorsed by Mastodon GmbH or Mastodon Inc.”
— Any fair use mentions or derivative usage of the Mastodon name (such as mstdn) should include the disclaimer.