"He explicitly said this has to be absolutely confidential," a federal official said.

In return, we must ask for your full cooperation in keeping this matter absolutely confidential.

Anything you may say to them is absolutely confidential.

He has promised to keep the paper and its contents absolutely confidential.

This news is absolutely confidential until released in the press.

I have given my word that what we are about to investigate will remain absolutely confidential between us.

I want your word that you'll treat anything you see or hear while on board this boat as absolutely confidential.

I've always treated everything I've seen or heard as absolutely confidential.

People, this has got to be kept absolutely confidential.

Yeah, but just remember, what I told you is absolutely confidential.