It's funny, "Eau Rouge" when translated into English means "Red Water." Not sure the GP venue will have a leg to stand on considering it's a long stream in Belguim. If this is the case, I'd imagine the state that the stream is located in could sue the GP for using the name.
http://autoweek.com/article/formula-...ainst-infiniti
http://en.wikipedia.org/wiki/Eau_Rouge