If the ministry had not had assistance from the US, the case would not have been handled so smoothly, Zhang said.
Thomas Dougherty, a trial attorney with the US Department of Justice's Computer Crime and Intellectual Property Section, said the US has the same trouble investigating cross-border online copyright violations.
If servers in other countries affect the IPR environment in the US, he said, his government will also ask for help.
However, such cooperation has not been extended to administrative departments, meaning some governmental plans to stamp out online copyright infringements cannot be properly enforced.
Wang Zhicheng, deputy director-general of the copyright department at the National Copyright Administration, said his office is considering cooperating with some US departments, but there are no specific plans.
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