Leading industry organizations and major Internet companies have vowed to better protect the copyright of online videos.

"The challenge comes with the technical advances needing to be addressed with technology. We'll keep making efforts to ensure intellectual property rights are respected and protected while providing good service for customers," said Wang Yangong, managing director of the copyright department at Baidu.

The proposal advised big companies not to buy advisements on websites which play pirated videos and not to sell unlicensed set top boxes on their sites, contributing to online video infringement.

As well as Baidu, Alibaba, Youku Tudou, iQiyi, Sohu TV and Le TV all signed the proposal at the second Qingdao-Northeast Asia Copyright Creativity Fine Products Exhibition and Fair, which ended on Sunday.

Leading industrial associations, including the Motion Picture Association of America (MPAA) and China Film Copyright Association, also joined the campaign.

"It clearly shows the attitude of stakeholders and gives clear guidance for the industry. It stresses both supervision from the government and self-discipline of the industry, we expect it to have good impact on the growth of the online video business in China," said Feng Wei, China president of MPAA.