[arethuza]

The European Court of Justice (ECJ) is the highest court in the EU for matters covered by EU laws - if there is a relevant law then presumably the case could get appealed all the way up to the ECJ.

Not sure about the WTO - wouldn't South Korea have to take on Samsung's case there against Germany?

[Atropos]

That is correct, only disputes between countries are settled to WTO law. German courts and the ECJ do not apply WTO law.