Legal notice
Last updated 2026-09-09
In accordance with Article 6-III of French Law No. 2004-575 of 21 June 2004 on confidence in the digital economy (LCEN), this legal notice identifies the publisher and host of the usekayu.com website.
1. Site publisher
The usekayu.com website and the Kayu app are published by:
- Publisher: Lucas Tostee
- Status: sole proprietor (auto-entrepreneur / micro-entreprise regime)
- Address: 66 rue des Remparts, 33000 Bordeaux, France
- SIRET: 830 928 412 00014 (SIREN 830 928 412)
- VAT: VAT not applicable, Article 293 B of the French General Tax Code (VAT-exempt small business — no intra-EU VAT number)
- Contact:
app.kayu@gmail.com
2. Publication director
The publication director is Lucas Tostee.
3. Site host
The usekayu.com website is hosted by:
- Vercel Inc.
- Address: 340 S Lemon Ave #4133, Walnut, CA 91789, USA
- Website:
https://vercel.com
4. App backend hosting
The backend services of the Kayu mobile app (authentication, database, sign-in code emails, logs) are hosted by Amazon Web Services EMEA SARL (Luxembourg), in region eu-west-3 (Paris, France). Personal data processed by the app stays within the European Union; details, including the two documented exceptions, are in the Privacy Policy.
5. Intellectual property
All elements of the site and app (brand, logo, design, text, code) are protected by intellectual property law and remain the property of Lucas Tostee. Medication data comes from public government sources and is used under their respective open-data licences:
- France: the Base de données publique des médicaments (ANSM), under the Licence Ouverte 2.0. The last-update date of the data in use is shown in the site footer.
- Canada: the Drug Product Database (Health Canada). Contains information licensed under the Open Government Licence – Canada.
- Spain: the CIMA nomenclátor (Agencia Española de Medicamentos y Productos Sanitarios — AEMPS), reused under its aviso legal, the AEMPS website aviso legal and Ley 37/2007 on the reuse of public-sector information. Fuente de la información: Agencia Española de Medicamentos y Productos Sanitarios www.aemps.gob.es. The date the data was obtained is shown in the site footer.
Data is reproduced without altering its meaning. Cross-country matches are computed by Kayu from this data; they are not published by these authorities. Neither ANSM, Health Canada nor AEMPS endorses Kayu or the matches it computes, and Kayu is not affiliated with any of these authorities.
6. Personal data and privacy
The processing of personal data, cookies, and your rights (access, rectification, erasure, objection) are described in the Privacy Policy. For any request regarding your data, write to app.kayu@gmail.com.
7. Contact
For any question: app.kayu@gmail.com.
This document was drafted with AI assistance and reflects the LCEN requirements as understood on 17 July 2026. It is not a substitute for review by a licensed lawyer.