Qualitative case-studies are widely used in many fields, but the reuse of qualitative case study data has received little attention in open science recommendations. Qualitative case study data is seldom reused due to privacy and confidentiality restrictions. This project has developed a novel decentralized procedure for the reuse of qualitative case study data, which maintains sovereignty over data. The procedure has been piloted with case study data collected by different researchers on open innovation. Insights from the project have been incorporated in the DANS guidebook on the reuse of qualitative data and are further developed in the NWO project OpenQUAL