More than 500 complaints were filed at the spring edition of this year's Canton Fair held in Guangzhou from April 15 to May 5, claiming intellectual property right violations, with 74.6 percent of them related to patent infringements. More than half of the IP violation suspects were proved as infringements, a 15.1 percent rise from a year earlier. Liu Jianjun, spokesman of the biannual trade event, said their enhanced IP protection efforts helped increase protection awareness of all stakeholders involved and created a sound transaction environment.