The British actor, who plays police commissioner James Gordon, has been banned from leaking any plot details ahead of the release of The Dark Knight Rises this summer (12).
Oldman recently revealed he suffered a nasty scare when he thought he had lost his script, which contains director Christopher Nolan's closely-guarded plot, but he eventually found it under the mattress in his hotel room.
The incident has made Oldman so paranoid about misplacing his scripts, he's taking extra security measures and locking them up at home for safekeeping.
He tells Britain's Daily Star On Sunday, "I daren't travel with my Batman scripts in case I lose them. I have to just make copies of the scene I'm learning that day.
"I keep all the scripts in a very safe place - they'd kill me if I lost one. I'd never take them on a train or anything like that. It's all pretty top secret.
"They code each script and put your name on it so if I ever can't find one I do panic. We really are sworn to absolute secrecy until the film comes out."