BEIJING AP _ Officials defended China’s efforts to stop rampant copying of movies and other goods, saying Thursday that 4,322 people were convicted of product piracy last year and promising special efforts to protect Olympics-related trademarks.

China is the world’s biggest source of illegally copied goods and trade groups say violations are growing despite increased penalties and repeated crackdowns. The illicit trade is fueling tensions with Washington, which has filed a World Trade Organization case over Beijing’s failure to stamp it out.