I have 3 of my National Anthem performances posted on youtube. There have been several times that someone claims copyright infringement. I go through the dispute process and the video gets reclassified as public that doesn't contain third party material. What could possibly be copyright protected in my videos? I play no special arrangement of the National Anthem. Youtube doesn't make it clear what is claimed as copyrighted. Hoping someone on TM knows a little about copyright protection.