And when did this tribe file for a copyright?
The NCAA is infringing on their rights to use or lend for use their own names ~ and trade-dress.
The NCAA will lose this one and this little tribe will make some bucks off them.
However, it's more like a TRADEMARK and those things just cruise along forever and ever. Kikoman, founded in Japan in the early 1600s, has a Trademark that's as protected now in America as it was nearly half a millenia ago ~ although I don't think they bring in a Samurai to cut off your head for stealing these days ~ but they could!
Remember, the Sioux have their own tried and tested techniques of ancient vintage.