Yep.
I made a pirate song and used some random beach sounds as ambience, and guess what. They were copyrighted. Who puts copyright on beach sounds?!
Anyway, I heard copyright infringement bans are permanent, but also that you just have to wait and they end, so I don't know what to do.
BevelHD
Happens to the best of us, never upload audio onto Newgrounds. I got copyrighted for fire sound effects...