"He has acknowledged that he publicly released the classified information that Valerie Plame Wilson was a secret agent for the CIA, triggering the Plame Affair, though he has said it was inadvertent."[1]
AFAICT (and IMHO peculiarly) nobody in this "affair" was ever actually charged with "revealing the identities of CIA agents", and Scooter Libby was definitely neither tried nor convicted of same. He was convicted of crimes (perjury, obstruction of justice), absolutely, but none that match your claim.
Further, according to [1] the case was pressed anew as a civil suit (by Wilson(s), and later, CREW, against Cheney, Rove, and Libby) which reached as high as the Supreme Court, failing at each step.
"The Wilsons have asked the U.S. Supreme Court to hear their appeal of the U.S. Court of Appeals ruling. On May 20, 2009, the Justice Department, in a brief filed by Solicitor General Elena Kagan ...
"According to the brief filed by the [Obama] Justice Department:
"Petitioners allege that Novak's July 14, 2003 column publicly disclosed Ms. Wilson's covert CIA employment and that that disclosure 'destroyed her cover as a classified CIA employee.' Petitioners, however, allege that Novak's source was Armitage, and do not allege that any of the three defendants against whom Mr. Wilson presses his First Amendment claim-Cheney, Rove, and Libby-caused that column to be published. In the absence of factual allegations that Mr. Wilson's alleged injury from the public disclosure of his wife's CIA employment is 'fairly traceable' to alleged conduct by Cheney, Rove, or Libby, petitioners have failed to establish Article III jurisdiction over Mr. Wilson's First Amendment claim."[1]
"He has acknowledged that he publicly released the classified information that Valerie Plame Wilson was a secret agent for the CIA, triggering the Plame Affair, though he has said it was inadvertent."[1]
[1] https://en.wikipedia.org/wiki/Richard_Armitage_%28politician...