Estate of Denial:  Warner Bros., and its DC Comics division has won the right to use potentially damaging documents in its fight to retain the rights to Superman.  The heirs of the Superman creators, Jerry Siegel and Joe Shuster claim that the rights to Superman should revert to them in 2013.  Three U.S. Court of Appeals judges ruled Tuesday that Warner Bros. can use documents showing that one of the heir's prior attorneys threatened to disclose an alleged settlement with the studio if the heirs worked with a different attorney.  Warner Bros. hopes the documents will help in its fight to retain the rights to Superman.  The attorney for the heirs claims the documents were stolen.