I want to download some content off of YouTube (for sound mostly and one video) to make an edit. I will not be using the full sound or video and plan to ask permission for anything I download, although that would be hard to do since not everyone leaves means of contact (which is understandable). Some videos I hope to download are from tv shows and multiple channels got a hold of them, so how would I ask permission when I’m not sure how they got the video? If it turns out they got the video illegally and I used it would I be doing something illegal? If I edit the video not for profit and if I give the person providing the video credit is this legal? How can I make this completely legal? I have seen many views on this and I just want to make content that follows the law. Thank you in advance and any knowledge or answer is appreciated.