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Privacy policy
Last updated: 9 November 2026
Controller
Daniel Alisch, Zum Weizenring 1, 14469 Potsdam, Germany. Email: daniel.alisch@me.com, phone: +49 151 74308033.
Summary
This website contains no analytics, tracking or advertising tools and sets no cookies for visitors. Fonts, images and videos are served from my own server; no third-party content (for example Google Fonts, YouTube or maps) is loaded. Personal data is only processed when you open the site (server logs), email or call me, sign up for the Lumi waiting list or use the website quick check.
Hosting and server logs
The website runs on a rented server of IONOS SE, Elgendorfer Straße 57, 56410 Montabaur, Germany, in a data centre in Germany. IONOS processes the data on my behalf (Art. 28 GDPR).
For every request the web server stores technically necessary information in log files: IP address, date and time, requested address, status code and amount of data transferred, the previously visited page (referrer) and browser and operating system (user agent). I need this information to deliver the site, find errors and fend off attacks. The legal basis is my legitimate interest in secure and stable operation (Art. 6(1)(f) GDPR). The logs are not combined with other data and are deleted after 14 days at the latest, unless they are needed longer to investigate a specific security incident.
Contact by email or phone
The site shows my email address and phone number as links; there is no contact form. If you write to me or call me, I process your details (for example name, email address or phone number and the content of your message) to handle your request. The legal basis is Art. 6(1)(b) GDPR where it concerns an engagement or its preparation, otherwise my legitimate interest in replying (Art. 6(1)(f) GDPR).
Emails are stored by the provider of my mailbox, Apple (iCloud Mail). I delete messages once they are dealt with, unless statutory retention obligations (for example for business correspondence) apply.
Browser storage
The site remembers your chosen language (German or English) and theme (light or dark) in your browser’s local storage (entries “language” and “theme”). This information never leaves your browser, is not transmitted to me and only serves to show the site the way you set it. This is strictly necessary for the function you requested (Section 25(2) no. 2 TDDDG). You can delete the entries at any time in your browser settings.
Blog
The site reads blog posts from my own database on the same server. There are no comments, no sign-in and no embedded third-party content; apart from the server logs, no data is collected while you read.
Lumi waiting list
On the Lumi page you can voluntarily sign up with your email address for news about Lumi. I use the Brevo service with double opt-in for this. Details on purpose, legal basis (consent), retention and withdrawal are in the Lumi privacy policy.
Website quick check
On /ki-check you can enter a website address, which my server then checks from the outside (home page, headers, certificate, robots.txt, llms.txt, security.txt, sitemap). The address you enter is processed, as is your IP address to prevent abuse. The result is kept in the server memory for up to 10 minutes so that a repeated check of the same address does not trigger new requests; your IP address is likewise only counted in memory for 10 minutes. Nothing is stored permanently and nothing is passed on to third parties. The legal basis is Art. 6(1)(b) GDPR (you request the check) and, for abuse prevention, Art. 6(1)(f) GDPR.
Admin area
Under /admin there is a sign-in area that only I use to maintain the content of the site. A cookie needed for the session is only set when signing in there. Visitors of the public pages are not affected.
Links to other providers
The site links to other services, for example the App Store, Amazon, YouTube, LinkedIn, GitHub or my own products at other addresses. Only when you click such a link do you leave this site; the privacy policy of the respective provider then applies.
Apps and games
Each of my apps and games has its own privacy policy:
Your rights
Under the General Data Protection Regulation you have the right of access (Art. 15), rectification (Art. 16), erasure (Art. 17), restriction of processing (Art. 18), data portability (Art. 20) and to object to processing based on legitimate interests (Art. 21). You can withdraw consent at any time with effect for the future. Just send me an email.
You also have the right to lodge a complaint with a data protection supervisory authority, for example the authority responsible for me, the Brandenburg Commissioner for Data Protection and Access to Information.
Changes
I update this policy when the site changes. The current version is always available at this address.