Last updated: November 2025
1. Data protection at a glance
General information
This overview explains what happens to your personal data when you visit this website.
Data collection
Who processes your data?
The controller is listed in the section “Controller”.
How do we collect data?
Some data you directly provide to us; other technical data are collected automatically.
What is the data used for?
To ensure error-free operation, security, and anonymous technical analysis.
Your rights
Access, rectification, erasure, restriction, portability, objection, withdrawal, lodging a complaint.
2. Hosting
Strato
Hosted by Strato AG, Berlin. Strato collects server log files (IP, browser, time, etc.).
Legal basis: Art. 6(1)(f) GDPR.
A Data Processing Agreement is in place.
More information: https://www.strato.de/datenschutz/
3. General information and mandatory disclosures
Data protection
Your data are handled confidentially and according to the GDPR.
Controller (data controller under GDPR)
Dr. Jürgen Tenckhoff
Röttgen 16
53773 Hennef
Germany
Phone: +49 2248 4451-33
Email: foto@tenckhoff.de
Storage period
Only as long as required for the stated purposes or legal obligations.
Legal bases
Depending on the context: Art. 6(1)(a–f) GDPR.
Recipients
No transfer of data to advertisers, tracking services or third-party analytics providers.
Your rights
Withdrawal, objection (Art. 21), complaint, access, rectification, erasure, restriction, portability.
SSL/TLS
Full-site TLS encryption.
Objection to marketing emails
We object to unsolicited marketing communications.
4. Data collection on this website
Server log files
Automatically collected:
Browser type and version
Operating system
Referrer URL
Host name of the accessing device
Time of the server request
IP address (shortened and anonymized by Strato)
Legal basis: Art. 6(1)(f) GDPR.
Contact
Processed according to Art. 6(1)(b) or (f). Deleted after completion.
Cloudflare Turnstile
Used to protect forms from automated submissions. Does not use tracking or advertising cookies.
Processed data include:
IP address
Browser/device information
Referrer URL
Timestamp
Diagnostic/security information
Legal bases:
Art. 6(1)(f) GDPR (security),
Art. 6(1)(b) GDPR (contract-related forms).
Cloudflare is a processor under Art. 28 GDPR and certified under the EU–US Data Privacy Framework.
More information:
https://www.cloudflare.com/trust-hub/privacy-and-data-protection/
5. Analytics and profiling
This website uses no tracking or marketing cookies.
Only technically necessary cookies are used.
Matomo
Self-hosted, anonymized, cookieless, no third-party data sharing.
Records only non-personal technical metrics.
Legal basis: Art. 6(1)(f) GDPR (technical performance and security).
6. Security & technology
Independent tests confirm:
SSL Labs: A+
Mozilla Observatory: A+
Hardenize: DNSSEC, DANE, MTA-STS, OCSP stapling properly configured
Ubuntu Pro Security Stack (optional information)
Our server infrastructure is built on Ubuntu Pro LTS, providing extended security maintenance, hardened kernel options, and continuous patching for critical and high-severity vulnerabilities. No personal data are transmitted to Canonical as all telemetry and diagnostic reporting features are disabled. Ubuntu Pro is used exclusively to ensure long-term system security and platform stability.
7. Local fonts & icons
All fonts and icons are locally hosted; no external requests.
8. Final note
This privacy policy is reviewed regularly.
Last updated: October 2025
Summary at a glance:
No tracking/marketing cookies
No external analytics or advertising services
Matomo locally hosted, anonymized, cookieless
A+ security standards
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