The goal of this report (type "Demonstrator") is to describe the fourth and final release of the SPECIAL platform. It builds upon the research done in WP2 by providing working implementations of many of the ideas presented in deliverables D2.5 Policy Language V2, D2.7 Transparency Framework V2 and D2.8 Transparency and Compliance Algorithms V2. It also offers an update over the previous release by reflecting on: the transition from HermiT to the SPECIAL reasoner (Chapter 4), the support for

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... essing full OWL policies (Chapter 4), Logstash, Elasticsearch and Kibana integration for added frontend flexibility (Chapter 5), the architectural changes and overall improvements in the personal data inventory (Chapter 6), the API, architectural, and data management changes to accommodate for the handling of data subject requests (Chapter 6), the overview of the public source code repository and associated licensing (Chapter 9). The first chapter presents the platform architecture as a whole. This will give the reader an overview of the various supported features, how the individual components interact and detailed information on some cross cutting concerns. In subsequent chapters specific components of the architecture are discussed in more detail. Special focus is placed on documenting design decisions which might not be obvious from the source code. At the time of publishing, the source code is available on GitHub , while the link to the latest working version of the platform is available on the SPECIAL website.