With Game of Thrones entering into its last season, keeping the plot a secret is of the utmost importance. HBO has famously gone to great lengths in the past to keep spoilers from leaking out, and things are being kept even more top secret this time around.

According to Game of Thrones star Nikolaj Coster-Waldau, the stars of the show don't have access to paper versions of the final season's scripts. In fact, the versions they do get access to automatically disappear once a scene is finished.

Coster-Waldau explained the extreme secrecy to Elite Daily:

They're very, very strict. It's reached a crazy level this year. We actually get the scripts, and then when we've shot the scene—and we only have it digitally—and then when you've done the scene, it just vanishes. It's like Mission: Impossible.

Because so much goes into productions like Games of Thrones, it's no surprise to hear HBO is using more sophisticated methods. When Disney was filming The Force Awakens, the production was very strict about secrets getting out—director J.J. Abrams had a script that featured red paper and black ink to keep prying eyes from snooping.

Chances are, some secrets will get out before the final season of Game of Thrones airs next year. But, hopefully, the use of digital scripts that disappear will help put a stint on leaks so as to keep audiences guessing.

Very little is known about season 8 of Game of Thrones, though plenty of theories have been floating around. With at least six more months until the show debuts, HBO will have to work very hard to keep the last season's secrets under wraps.