China said Tuesday it is cracking down on intellectual property theft despite US criticisms of its anti-piracy efforts, CNN reported. What's more, Chinese officials said countries like Canada have worse problems. Speaking at the World Trade Organization, officials appealed for more cooperation and dialogue. State Intellectual Property Office spokesman Yi Xintian said the government "has made tremendous efforts and taken a lot of steps to protect intellectual property rights." American officials say piracy is costing producers tens of billions of dollars in potential sales lost. But Wang Ziqiang, a spokesman for the National Copyright Administration, said other countries like Canada have more serious piracy problems. He said a report by the US-based International Intellectual Property Alliance put annual per capita losses to piracy in Canada at US$16.78 compared to US$1.68 in China.