The German constitution is entirely irrelevant to an American corporation basing its creation and protection of its work within the American laws designed to protect it.
I've just reduced it to this, because 1) I don't want to spend all my time explaining things, and 2) it really is the crux of the matter. We were debating morality, not legality. We all agreed that a leak would be against American law. The debate was whether a leak was morally wrong or not. But it seems it is the same debate to you, meaning to you American law and morality are interchangable. It is a position that is so profusely stupid that I can't even imagine it being honest.
And, okay, I guess I can't let that part go; I accept your claim that you never looked at Snyder's leaked JL material, as unlikely as that sounds. But, should Snyder not have been faced with legal consequences for them?
You outright called for legal consequences for anybody participating in a hypothetical leak of the Batgirl film, so being consistent, you should also call for Snyder facing those same legal consequences.
But you don't. You never have. And that's the main problem here, your hypocracy. Nobody cares if you personally watch leaked material or not, that's a personal decision, and - as most of us agree, even @fireproof78 - a matter of personal views. But you went ahead and not only called anybody even watching leaked material immoral, but calling for legal consequences for a leak when you did nothing of the kind when the leaker was somebody you liked.