Stakeholders (re-)gain digital sovereignty allowing various stakeholders to adapt Internet-of-Things systems according to their privacy needs, either on the organizational or individual level. Both are required, in order to preserve intellectual property, and handle control in a transparent way. The project thereby unlocks additional adoption potential for IoT-based products and services, affecting production, healthcare, smart home, and logistics. The basic enabler is digital twin modeling and execution. It uses a message-passing protocol for tracing privacy data, their collection, processing, distribution, and control. Hence, the approach significantly impacts digital literacy of IoT users and developers, while reducing development effort through its design-integrated engineering nature.