This dataset is certainly not open source if you aren't allowed to use or even view the images. From the Open Source Definition (OSD): > 6. No Discrimination

This dataset is certainly not open source if you aren't allowed to use or even view the images. From the Open Source Definition (OSD): > 6. No Discrimination Against Fields of Endeavor > The license must not restrict anyone from making use of the program in a specific field of endeavor. For example, it may not restrict the program from being used in a business, or from being used for genetic research. https://opensource.org/docs/osd https://opensource.org/docs/osd