Interesting question. This is not legal advice so take what I say with a grain of salt. I think there is an argument to be made from both sides. On one hand, t

Interesting question. This is not legal advice so take what I say with a grain of salt. I think there is an argument to be made from both sides. On one hand, they are providing public URLs and they are the ones who should implement security mechanisms in order to avoid what you are doing with their content. There is also precedent regarding web scraping (which is not exactly what you are doing, but some arguments still apply). [1] On the other hand, just because you attribute ownership to them in regards to their content, it does not mean you are not infringing copyright. [1] https://news.ycombinator.com/item?id=22180559 https://news.ycombinator.com/item?id=22180559