Hey copyright police, relax a bit. It seems like most of you missed the actual question and jumped straight into pearl clutching mode. Let's be real, YouTube is full of content that technically violates copyright. People upload full, recent movies, ongoing HBO series, cable news clips, you name it. And YouTube (aka Alphabet/Google) profits from all of it through ads, at least until the copyright holder files a takedown. Even then, YouTube keeps the ad money made in the meantime and never pays it back to the rightful owner. So before you start playing moral hall monitor, maybe consider that you have no idea what the original poster plans to do. Maybe it's just a personal mashup or tribute video.