They have them, yes, but they don't acknowledge foreign country copyrights. Only within their own country and "whenever they feel like".
Basically, if SE tried to sue a Chinese company for copyright violation, they'd just never hear a reply back, or they'd get a letter saying that their copyright isn't recognized. And since China doesn't extradite or cooperate in legal issues, they couldn't even get a representative from China to visit the court anyway.
