Cookies & privacy
Our own website code uses no analytics or advertising trackers. The internal administration area uses platform sign-in with its own privacy and cookie rules.
Cookie details
Our own code loads no analytics or advertising trackers, remote fonts, maps or videos. Language is selected through the URL. Calculators and examples run locally without sending inputs to an AI service. “Close for this visit” stores bd_cookie_notice=v1 as a session cookie. The browser manages the session and may retain the state when restoring it. “Remember for 180 days” saves the same choice for up to 180 days. Our notice sets no cookie before either choice. It only remembers the requested notice state, contains no user ID and enables no extra services. Necessary storage relies on section 25(2)(2) TDDDG and, where personal data is processed, Article 6(1)(f) GDPR. Reset the choice on the cookie page. Platform sign-in and security may use their own necessary cookies, governed by platform controls rather than our notice.