Terms of use.

Last updated 11 October 2026

These terms cover two things: using this website, and running the Semurg software on hardware you control.

Licence to run it

• A single node is free, self-hosted, with no time limit and no telemetry. Use it for evaluation, for internal work, or in production, on hardware you control.
• Each node after the first needs its own licence. A single node never needs a licence key. Adding a node to a cluster takes one licence per added node, lifetime (for the working life of the hardware it is first installed on, not transferable to another machine) or annual, at the prices on the pricing page; we issue the key and the node verifies it offline. Updates are free for every node.
• Do not redistribute the engine. You may not resell, sublicense, rehost as a service, or redistribute the binaries or the installer to third parties without written permission. Running it for your own organisation, including for your own customers' data, is exactly what it is for.
• Do not reverse-engineer the engine or attempt to remove or defeat the licence check.
• The client SDKs shipped in clients.tar.gz are open for you to read and adapt for your own integration work; the Python client, published on PyPI as semurg, is Apache-2.0.

The numbers on this site

Every figure we publish is our own measurement on our own reference hardware, and the method is published alongside it so you can reproduce it. Performance depends on your CPU, disks, memory and workload, so your numbers will differ: that is why we ship the kit rather than asking you to trust a chart. Anything not yet live is marked as not yet live.

We run each engine in its fastest documented form on our hardware; that is not a claim about its best case on yours. Where we compare, we say what we ran, on what data, on what box.

Warranty and liability

The software is provided as is, without warranty of any kind, express or implied, including merchantability, fitness for a particular purpose and non-infringement. You are responsible for how you deploy it, for your own backups, and for the security of the hardware and network you run it on.

To the maximum extent permitted by law, Semurg is not liable for any indirect, incidental, special or consequential damages, or for lost profits, revenue or data, arising from use of the software or this website.

The honest caveat, stated plainly: parts of the system are explicitly marked as still building, and those parts have had no penetration test of their own. We say so on the pages themselves. Weigh that before putting any of it in front of hostile traffic.

Acceptable use of this website

Do not attempt to break, overload or gain unauthorised access to this site, the download endpoints, or any Semurg-operated host. Automated scraping that degrades service for others is not acceptable use. Security research is welcome: tell us first at semurg@semurg.org and we will work with you.

Changes and contact

We may update these terms; the date at the top always reflects the current version. Questions, licences and anything unclear: semurg@semurg.org. See also the privacy page.