Privacy policy
Last updated: 31 October 2026
The best personal data is the data you do not collect. This site contains no forms, no cookies and no audience-measurement tool.
Data controller
Tarek BELHADJ, sole proprietor trading under the business name KAYZEN, 6 rue Pierre Termier, 69009 Lyon (see the legal notice). Contact: contact@kayzen-lyon.fr.
Data processed on this site
No data is collected by the publisher through this site: it contains no forms, no cookies and no audience-measurement tool. To serve you the pages, the host Vercel technically processes your IP address and the information sent by your browser; this processing is necessary for the site to function (legitimate interest).
If you write to us
If you write to us by e-mail or telephone, we use your contact details and your message solely to reply to you. These exchanges are kept for a maximum of 3 years after the last contact.
Recipients and transfers
Site host: Vercel Inc. (United States). Transfers of data outside the European Union linked to hosting rely on the safeguards provided for by the GDPR (EU–US data protection framework or standard contractual clauses).
The VPN service
The privacy policy specific to the Kayzen VPN service, presented in the application, describes precisely the strictly necessary data (account number fingerprint, public keys, free-tier consumption counter) and the absence of activity logs.
Your rights
You have the rights of access, rectification, erasure, restriction, objection and portability, by writing to contact@kayzen-lyon.fr. You may lodge a complaint with the CNIL, the French data protection authority (www.cnil.fr).