How flexible is the principle of causality?

[tor]

It has nothing to do with carrying information.
All uncertainty principle is telling us that we can't measure quanta properties without affecting it which is why we can't know for sure both position and momentum. It tells us NOTHING about if movement of particles is TRULY random or deterministic in nature. But since we can't measure that it will remain a mystery forever.

I agree that we will not know, unless we discover a way to measure hidden variables. But I'm saying - in the framework of the copenhagen interpretation, what is its stance?

To know if true randomness is possible you must disprove determinism completely. And to do that you must measure all the data there is which is not possible in my opinion.
As for copenhahen principle hawking thinks it's determined. But it's just speculation both ways. I have no idea if it's determined or not.