Originally Posted by
Dhalmel
Just because you can or done so in the past, doesn't mean you're legally right. If square REALLY wanted to they could sue you for making money off their material without their permission.
As to OP
Often this is the case of a false flag but this time it seems correct. I've once had a preview track I uploaded flagged for copyright infringement, see here "http://www.youtube.com/watch?v=BU_XsmfL1bU". What was odd was that I had written and verbal permission Katsuhiko Maeda himself to upload. Turns out it was some phony organization claiming it was their content.
Best thing for you to do is nothing this is just to prevent you from making money off of your video