Certum is the trust-service brand of Asseco Data Systems S.A., part of the Asseco Group, which runs it as a qualified trust service provider. Its offer covers qualified electronic signatures, electronic seals, document verification and qualified timestamps. The company states that its services are listed on the Polish national trusted list and on the Adobe approved trust list, and the website is also available in Polish.
The site links to the Polish national entry on the EU trusted list, which places the service under Polish supervision within the EU. The website says the technical infrastructure is located in the EU, but it gives no further detail on data hosting, and the pages reviewed contain no explicit GDPR statement. No ownership outside the EU is identified, and the Asseco Group parent is not described further on the pages reviewed. For a European organisation, the main points to confirm are where signing data is stored and the contractual terms for processing it.