1. Controller
Nicole Rost, trading as ROST SYSTEMBAUSTOFFE
Siedenkamp 1A, 23730 Sierksdorf, Germany
Email: service@rost-systembaustoffe.de
Phone: +49 (0) 4563 471 98 22
2. Hosting and use of the website
This website is hosted and technically provided through ChatGPT Sites by OpenAI. For users in the European Economic Area, OpenAI Ireland Limited, 1st Floor, The Liffey Trust Centre, 117–126 Sheriff Street Upper, Dublin 1, D01 YC43, Ireland, is the contracted hosting service provider and processes personal data on our behalf.
When the site is accessed, data processed may include the IP address, time and destination of access, protocol and usage data, and browser, device and system information. The purpose is to provide the website securely, reliably and without errors. The legal basis is Article 6(1)(f) GDPR. Our legitimate interest is the secure and reliable operation of our website.
OpenAI processes hosting data for the duration of the service and thereafter only for as long as required to meet contractual obligations, including deletion, or statutory duties. According to OpenAI, transfers outside the European Economic Area are based on European Commission adequacy decisions or EU standard contractual clauses.
The website contains no advertising services, input forms or user accounts.
3. Audience measurement with Cloudflare Web Analytics
We use Cloudflare Web Analytics, a service of Cloudflare, Inc., to obtain anonymous, aggregated information about page views and the technical performance of this website. According to Cloudflare, this service does not use cookies or client-side identifiers such as local storage, track individual visitors across websites, or collect or use personal visitor data.
The analytics code is loaded from Cloudflare when a page is opened. Its sole purpose is statistical analysis and improvement of the website. Where connection data is processed during technical transmission, this is based on Article 6(1)(f) GDPR. Our legitimate interest is privacy-conscious audience and quality measurement.
Further information is available in Cloudflare’s privacy policy and Web Analytics documentation.
4. Contact by email or phone
If you contact us, we process the information you provide in order to handle your enquiry. The legal basis is Article 6(1)(b) GDPR where the enquiry concerns steps prior to entering into a contract or performance of a contract. Other business enquiries are processed under Article 6(1)(f) GDPR; our legitimate interest is the proper handling of the enquiry. Information is deleted when it is no longer required and no statutory retention duty applies.
5. External links and downloads
External services, such as POLYSAND or ROX-TOOLS, are opened only when you click the relevant link. The privacy information of the respective operator then applies. Files provided locally are delivered by the same hosting service as the rest of the website.
6. Recipients
Recipients of personal data include OpenAI as hosting and infrastructure provider and, where connection data is generated when audience measurement is technically provided, Cloudflare. We transfer data to other recipients only where necessary to process an enquiry or required by law.
7. Data subject rights
Within the scope provided by law, data subjects have rights of access, rectification, erasure, restriction of processing, data portability and objection. Consent may be withdrawn at any time with effect for the future. Contact the controller named above to exercise these rights.
You also have the right to lodge a complaint with the Unabhängiges Landeszentrum für Datenschutz Schleswig-Holstein, Holstenstraße 98, 24103 Kiel, Germany, email: mail@datenschutzzentrum.de, www.datenschutzzentrum.de.
8. Version and language
14 September 2026
This English translation is provided for convenience. The German privacy policy is authoritative.