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The short version is that almost everyone with enough access to make a local copy of the movie is financially and/idealistically incentivized enough by future opportunity within the industry not to risk it.

For everyone else, there’s law enforcement supported by unlimited budget for prosecution from the industry.

> How do you even prevent that?

Keep the working copies on computers in a special lab with no external network access.

Restrict access and physically search the people leaving the lab.

Not fool proof, but it will reduce leaks by a lot.

But yeah, once you send out thousands of review copies, there's no stopping the leaks.

But usually a movie is worked on by multiple VFX companies and whatnot.

I would be shocked if copies shared with third parties did not contain obvious and hidden fingerprint watermarks through the film. If the leak can be traced back to a particular studio, they are going to be black balled forever.

Most studios moved to a high security environment a while back. Only Covid reopened things a bit, and not sure how long.