Who owns “Who Dat?”

In a report by the AP:

In wake of New Orleans trip to Super Bowl XLIV, some T-shirt makers who were hit with cease-and-desist letters from the NFL demanding that they stop selling shirts with the traditional cheer of New Orleans Saints fans. The chant — “Who dat say dey gonna beat dem Saints” — is often shortened to “Who Dat” on shirts and signs and has been a mainstay at the Superdome since the 1980s. Check out the legal details HERE as this case presents some interesting trademark issues. From another perspective, just seems like everyone wants a piece of the Who Dat Nation nowadays.