This data set includes extracted information from 40 CoreTrustSeal (CTS) self-assessment reports, which were publicly available by January 15th 2019 at https://www.coretrustseal.org/why-certification/certified-repositories/. The authors extracted general information from the title pages of the self-assessment reports, as well as responses to criterion "R0 - Background Information / Context". Sheet "Extracted_Information" includes all extracted info, whereas "Level_of_Curation", "Designated_Community" and "Repository_Type" include normalized and categorized data. The data cleansing / normalization and analysis processes are described in the paper "Eye on Core Trust Seal - Recommendations for Criterion R0 from Digital Preservation and Research Data Management Perspectives" to be released as part of the Proceedings of iPRES2019, the 16th International Conference on Digital Preservation. The data set forms the basis for an extended analysis of Core Trust Seal criterion R0 from the perspectives of the digital preservation and research data management domain. Abstract of the accompanying paper: The CoreTrustSeal (CTS) is an accepted trustworthy digital repository certification process for both, research data management and digital preservation communities alike. But does it build on concepts known and understood by both of these communities? We take an in-depth look at the CTS requirement R0 - Background Information / Context, in which the applicants are asked to define their repository type, designated community and level of curation performed. By extracting information from the publicly available assessment reports and cross-checking these against available supporting information, we reflect on CTS from three viewpoints: the process, the institutional, and the community view. We distill concrete recommendations, which will be fed back to the CTS Board as part of the 2019 public call for review.