Seems it is American technology most likely.
http://www.cbsnews.com/stories/2011/...n7274614.shtml
Quote:
Chinese officials recently unveiled a new, high-tech stealth fighter that could pose a significant threat to American air superiority - and some of its technology, it turns out, may well have come from the U.S. itself.
Balkan military officials and other experts have told The Associated Press that in all probability the Chinese gleaned some of their technological know-how from an American F-117 Nighthawk that was shot down over Serbia in 1999.
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American science and technology is still widely copied.