Reuters reports on the concerns raised as the U.S. Senate consider legislation to curb patent trolls. Sen. Richard Blumenthal, Democrat of Connecticut, said he is "wary of unintended consequences," while bill sponsor Sen. Patrick Leahy said the legislation balances the rights of patent holders against patent trolls who buy up patents just to pursue litigation. Among other measures, the legislation would require losers in patent litigation to pay the winner's fees if a judge decides the litigation never should have been brought.