How would you know it occurred? The approval system for this is secret. It would require that Signals actively come forward and say that they did this, when some other government body finds the material and charges you with a crime.

You would need to both know it happened, and be able to prove it happened, and the usual targets for something like this (journalists) can usually only suspect the former at most.

It's one of the most dystopian laws I've ever seen.