When I edit videos, I keep meticulous notes on where any third party content comes from, and note it in the description of my video. Even so, I have had copyright claims made against my videos, mostly regarding the music I use. These claims can be obnoxious, though I don’t necessarily agree that there’s any merit to claims that they are scams. At any rate, when a claim is made, you need to file a dispute, detailing where the music is sourced from.