imperia CMS is a headless content management system from pirobase imperia GmbH, a German company with its registered seat in Cologne. It is aimed at organisations that run large, business-critical websites and digital services, and according to the vendor it is used by governments and financial institutions. Content management is separated from front-end delivery, so the same content can be published through several channels. The product is offered as a cloud service, as a hybrid setup or for on-premises installation, so customers decide where the system runs.
For a European organisation the relevant sovereignty facts are as follows. The vendor is German and states that its cloud platforms process data in Germany and are hosted in German data centres. No foreign parent company is named on the vendor's website. Whether the source code is available is not stated, so the on-premises option is not presented as open source.