The estate of Superman creator Joseph Schuster is suing Warner Bros. Discovery and DC Comics alleging that its planned release some key territories is illegal.
If everything else about the question at hand and the parties to the litigation makes sense for a particular court, they’re more than willing to interpret foreign law with the right amount of notice and limits to the scope of the inquiry. Some of the procedural hijinks you may see in this case could involve trying to remove it to courts in those countries though.
The simple answer is, and I shit you not, they look it up and try their best.
If everything else about the question at hand and the parties to the litigation makes sense for a particular court, they’re more than willing to interpret foreign law with the right amount of notice and limits to the scope of the inquiry. Some of the procedural hijinks you may see in this case could involve trying to remove it to courts in those countries though.