Source: http://wrestlinginc.com/wi/news/2012/0119/548782/ric-flair/"The argument could be made that TNA has the legal right to sue WWE since they are using a contracted TNA performer to draw ticket sales and DVD sales for the 2012 WWE Hall of Fame with Ric Flair being inducted with The Four Horsemen.
According to The Wrestling Observer, No word yet if TNA will pursue any kind of action against WWE but as of earlier this week, they had not made any decision. It's possible TNA could work out a deal where WWE would pay them a settlement for their usage of Flair.
For what it's worth, Ric Flair has admitted privately that the 2012 WWE Hall of Fame appearance is not a done deal legally and referred to getting TNA's approval as a "technicality."
That's going to really suck..