Adding datasets to untar_data

I have a question regarding this. What specific copyright/usage should we be looking for if we want to add a dataset? I’m working with labeled keypoints at the moment and my test dataset is the Cat dataset. The kaggle is here which was originally from here In terms of copyright it just states “The CAT dataset is only for research purposes, we do not have any copyright of the images.” Would this mean it’s a good candidate?