The EFF is only today able to release details of an attempt by the government to alter the historical record in the case brought by the EFF against the NSA in Jewel v. NSA. "On June 6, the court held a long hearing in Jewel in a crowded, open courtroom, widely covered by the press. We were even on the local TV news on two stations. At the end, the Judge ordered both sides to request a transcript since he ordered us to do additional briefing. But when it was over, the government secretly, and surprisingly sought permission to "remove" classified information from the transcript, and even indicated that it wanted to do so secretly, so the public could never even know that they had done so."
As you'd expect of the EFF, they fought back with vigorous objections, and in the end the government did not get its way, instead deciding that it hadn't given away any classified information after all.
"The transcript of a court proceeding is the historical record of that event, what will exist and inform the public long after the persons involved are gone. The government's attempt to change this history was unprecedented. We could find no example of where a court had granted such a remedy or even where such a request had been made. This was another example of the government's attempt to shroud in secrecy both its own actions, as well as the challenges to those actions. We are pleased that the record of this attempt is now public. But should the situation recur, we will fight it as hard as we did this time."