Terms and proprietary notice
Copyright 2026 SOPHIA XT LLC. All rights reserved. Last revised 15 September 2026.
A custom platform, not an assembled one
This site and the systems behind it are built in house by SOPHIA XT LLC. The architecture, the interface, the simulations and figures on the research pages, the narration, the music, the models and the game published here are our own work. Nothing on this site is a licensed template, a purchased theme or a third-party site builder, and the platform is not offered for resale or reuse.
What is owned, and by whom
All software, source code, design, text, figures, imagery, audio, video, datasets and documentation published on sophiaxt.com are the property of SOPHIA XT LLC or of the parties who licensed them to us, and are protected by copyright and other intellectual property law. Third-party names and marks referenced on the site belong to their owners.
Research on this site cites its sources. Where a figure reproduces a published result, the citation is on the figure. That citation does not transfer any right in our implementation of it.
What you may do
Read the site, link to it, and quote it with attribution and a link back to the page you took it from. Download the documents we publish for download, and run the game we publish for play. Use the open specifications we release under the licence stated on their own page, on the terms that licence sets out.
What you may not do
Copying, mirroring, scraping in bulk, republishing, decompiling, or deriving a competing product from this platform is not permitted. Neither is embedding our media in another site, presenting our work as your own, or removing the ownership notices that the site serves with its files.
Use of this site or its content as training data for a machine learning model is not permitted without written permission. That restriction covers the text, the figures, the code, the audio and the narration.
Service terms and privacy
The terms covering accounts and use of the products, and the privacy policy covering what the site collects, are separate documents.
Both open from the links in the footer of any page on this site.
The signing key, and what a signature here proves
This site signs a challenge on request at /api/attest, using an Ed25519 key held on the server and in no build, no repository and no deploy. A copy of this site can serve every file byte for byte and still cannot answer the challenge.
What that proves depends entirely on where you got the key. A signature checked against a key served by the same host proves only that the host holds the key it just gave you, which a copy with its own key satisfies just as well. So check the fingerprint against a source this server does not control before you trust a signature from it.
public key ndnvVfbIrUeL4zr7TYm3w45s8KRoPoV5L2WVj9tXplo= fingerprint sha256 0ad9b1aaaf776f238a11fbbf30f0a7efc18275d6bcc4dff1a7b8099b2966e45c
The same fingerprint is published in this site's machine-readable file at /llms.txt, and is being published as a DNS record at _sophia-attest.sophiaxt.com, which is held by the domain registrar rather than by this server. Until that record resolves, treat the attestation as evidence rather than as proof.
Permission and takedown
Requests for permission, licensing enquiries and infringement reports go to SOPHIA XT LLC, St. Louis, Missouri, through the contact page. Include the page or file at issue and what is being asked for.