In both Slicer or extensions, datasets with specific restrictions can be distributed.
For example, the
CTA abdomen (Panoramix) dataset coming from Osirix DICOM image library is available for download through the SampleData module interface but it is exclusively available for research and teaching. It is not possible, to redistribute or sell it, or use it for commercial purposes.
Acknowledgement section is explicit about it. See screenshot below, I suggest we update the SampleData module to (1) display a warning when used click on the download button or (2) remove datasets that are not freely available for any purpose.