Fox News in August 2002 had an interview with Richard Clarke (then working for Bush White House). Clarke was on background, which is why Fox had to seek permission from the White House to release the transcript yesterday, identifying Clarke as the source. (The White House, of course, granted permission)
Apparently, this is how it is done.
I have no quarrel with that, but it does lead me (and others) to wonder — why can’t the White House de-"background" whoever it was who talked to Novak about Valerie Plame?