^^^^^
You don't appeal a request for evidence of usage rights. You either provide statements of how you have commercial rights in every portion of your video, or you get denied monetization of that video. Such statement can include that you have written permission from a rights owner, or a link to a royalty free or public domain music's terms of use. I've actually seen cases where people who filmed a video themselves and provided all of the music via their own composition, have to say to YouTube Admin "I, [name], hereby grant myself the right to use this work of my own authorship commercially".
In this case, it isn't a matter of copyright infringement; it's a matter of licensing levels. There are licenses in existence which only allow for non-commercial usage, and YouTube is well aware of this. So I guess they are covering themselves against people who violate licensing terms by doing this. You're very welcome for the help; this is definitely one of the more annoying things YouTube has come up with, for sure!Thanks for the help.
It is pretty annoying. It would be nice if they could could just grant monetization automatically, unless there was at least prima facie evidence of copyright infringement. Or if they wanted to be thorough and consistent, they could just withhold monetization until they'd reviewed each video manually (of course, that would be even more annoying for us). As it stands it feels like a roll of the dice each time you upload a video. Oh well.
