Bluesky Social PBC owns the AT Protocol, atproto, and atprotocol trademarks. We want them used widely and responsibly across the ecosystem, so this page and the full policy are written to make ordinary, good-faith use easy while keeping the marks reliable indicators of the actual AT Protocol and the projects built on it.
Most everyday uses need no permission. You can refer to the AT Protocol, say your project is built on it or compatible with it, write documentation and tutorials, discuss it in the community, and name open-source packages, repositories, and tooling descriptively (for example, atproto-feed-tools or "an SDK for atproto"). As a general rule be accurate, don't imply your work is official, and keep your own name at least as prominent as the mark.
Some uses do need written permission, mainly when a mark becomes your brand rather than a description. That includes product, company, or service names built around the marks, paid or sponsored events, merchandise for sale, registered domain names, official-sounding certifications, and use of any official AT Protocol logo. A few uses are never allowed, such as impersonation, scams, or presenting an incompatible protocol as the AT Protocol.
To request permission, report misuse, or ask a trademark question, and for the complete rules, examples, and the standard permission terms, see the full AT Protocol Trademark Policy.