Hi guys, I have been doing some research on copyrighting images on BHW. I know that for example pixybay can be used for free images with CC0 tag which the photographer (poster) himself declares. Question: how do I know the photographer himself simply did not steal the image, put the CC0 license on it and claimed it as his? What if tomorrow they decide it is no longer a CC0 image and decide to change the license? Would I be at risk of infringement?