Sergej's website

— Technical Notes

Privacy Policy

1. Controller

The controller within the meaning of the EU General Data Protection Regulation (GDPR) for data processing on this website is:

Sergej Keller
Berner Str. 1
70619 Stuttgart, Germany
Personal Email: show e-mail
Business Email: show e-mail

2. Hosting and server log files

This website is operated on a server rented from Hetzner Online GmbH, Industriestr. 25, 91710 Gunzenhausen, Germany, located in a data center in Nuremberg, Germany. The server is administered by the controller himself. Hetzner provides the infrastructure. A data processing agreement pursuant to Art. 28 GDPR exists with Hetzner.

When you visit this website, the web server automatically records so-called server log files. These include: the IP address of the requesting device, date and time of the request, the requested URL, the HTTP status code, the amount of data transferred, the referrer URL, and the browser identification (user agent). This data is processed to deliver the website reliably, to detect and defend against attacks and misuse, and to analyze technical faults. The legal basis is Art. 6 (1) (f) GDPR (legitimate interest in the secure and stable operation of the website). Log files are deleted or anonymized after a short period unless a specific incident requires longer retention as evidence.

3. TLS encryption

This site uses TLS encryption (HTTPS) for all connections. Data you transmit to this site cannot be read by third parties in transit.

4. Cookies

This website does not use tracking, analytics or advertising cookies. Only technically necessary cookies may be set, for example when you log in (administration) or when you submit a comment and ask the site to remember your details. Technically necessary cookies do not require consent pursuant to § 25 (2) TDDDG. No consent banner is therefore displayed.

5. Comments

If you leave a comment, the comment text, the name and email address you provide, your IP address and the time of submission are stored. The IP address is stored on the basis of our legitimate interest (Art. 6 (1) (f) GDPR) in being able to defend against unlawful comments (e.g. insults, prohibited content), for which the operator can be held liable. Comments and their metadata remain stored until the commented article is deleted or you request deletion of your comment.

6. Spam protection with Akismet

This site uses the Akismet anti-spam service, provided by Automattic Inc., 60 29th Street #343, San Francisco, CA 94110, USA. When you submit a comment, the submitted data, including the comment text, your name, email address, website (if provided) and IP address, is transmitted to Automattic servers in the USA and analyzed there to determine whether the comment is spam. The legal basis is Art. 6 (1) (f) GDPR (legitimate interest in operating the site free of automated spam). The transfer of data to the USA is based on the EU–US Data Privacy Framework and/or standard contractual clauses pursuant to Art. 46 GDPR. Further information: https://automattic.com/privacy/. If you do not wish your data to be transmitted to Akismet, please refrain from commenting and contact us by email instead.

7. Security scanning with Wordfence

This site uses the Wordfence security plugin, provided by Defiant Inc., 800 5th Ave, Suite 4100, Seattle, WA 98104, USA. Wordfence protects the website against attacks, malware and unauthorized login attempts. For this purpose, the IP addresses of visitors, request characteristics and, where applicable, login data are processed and compared against Defiant’s threat databases, which may involve transferring IP addresses to servers in the USA. The legal basis is Art. 6 (1) (f) GDPR (legitimate interest in protecting the website against attacks and abuse). The transfer of data to the USA is based on the EU–US Data Privacy Framework and/or standard contractual clauses pursuant to Art. 46 GDPR. Further information: https://www.wordfence.com/privacy-policy/.

8. Contact by email

If you contact us by email, your message including the personal data you provide (name, email address, content) is stored for the purpose of handling your inquiry. The legal basis is Art. 6 (1) (b) GDPR where your inquiry relates to a contract, otherwise Art. 6 (1) (f) GDPR (legitimate interest in answering inquiries). This data is deleted once your inquiry has been dealt with, unless statutory retention obligations apply.

9. Affiliate links

Articles may contain affiliate links to third-party merchants. When you click such a link, you leave this website; from that moment, the privacy policy of the respective merchant applies. This website itself does not transmit any personal data to the merchant. The merchant may use cookies on its own site to attribute a purchase to the link you clicked.

10. Your rights

You have the following rights with regard to your personal data:

  • Right of access (Art. 15 GDPR)
  • Right to rectification (Art. 16 GDPR)
  • Right to erasure (Art. 17 GDPR)
  • Right to restriction of processing (Art. 18 GDPR)
  • Right to data portability (Art. 20 GDPR)
  • Right to withdraw consent given (Art. 7 (3) GDPR), with effect for the future

Right to object (Art. 21 GDPR): Where processing is based on Art. 6 (1) (f) GDPR (legitimate interest), you have the right to object to the processing of your personal data at any time, on grounds relating to your particular situation. We will then no longer process the data concerned unless we can demonstrate compelling legitimate grounds for the processing that override your interests, rights and freedoms, or the processing serves the establishment, exercise or defense of legal claims.

You also have the right to lodge a complaint with a data protection supervisory authority. The authority responsible for us is:
Der Landesbeauftragte für den Datenschutz und die Informationsfreiheit Baden-Württemberg
Lautenschlagerstraße 20, 70173 Stuttgart
Germany
https://www.baden-wuerttemberg.datenschutz.de

11. No automated decision-making

No automated decision-making or profiling within the meaning of Art. 22 GDPR takes place on this website.

12. Changes to this privacy policy

We reserve the right to adapt this privacy policy so that it always complies with current legal requirements or to reflect changes to the services offered. The current version always applies to your visit.

Last updated: 19 July 2026