It is an open secret that generative AI models have also been trained on any kind of datasets developers could get hold of and regardless of the legality of their practice. Concerns about the conformity with copyrights law and the General Data Protection Regulation abound. In relation to general-purpose AI (GPAI) models the European Union's Artificial Intelligence Act foresees the disclosure of public information about training data. Soon the providers of GPAI models will have to publish a sufficiently detailed summary of the data used to train their models. What this summary should look like is subject to ongoing debate as the EU’s AI Office is developing a template for the summary. In this panel we will take a closer look at the emerging contours of the template in light of the purpose of this summary.