Legally you can take a stranger's photo for yourself and keep it if it's in public. Unless there is a being model case the photo belongs to the photographer. So

Legally you can take a stranger's photo for yourself and keep it if it's in public. Unless there is a being model case the photo belongs to the photographer. So anyone can take pictures of people and bands in concerts and they do. Thing is how they're using them. If you sell that to a brand there should be a model release. On every other case even for the person itself he or she should pay for the sharing license. Take real models as an example they are being photographed and they are released in stock photo markets the only thing they can do is finding themselves on that marketplace. Later on they share stock photo branded screenshots :). Because they don't pay for the original ones. They need to pay for the photos that includes them as the subject.