BEIJING, Sept. 14 (Xinhua) -- China's copyright authority Friday summoned representatives from 15 major video-sharing platforms, including Douyin, or Tik Tok, Kuaishou and Bilibili, over copyright concerns.

Noting the existing copyright problems and other issues reported in the enterprises' self-checks, the National Copyright Administration told relevant enterprises to further raise their awareness of copyright protection, improve copyright systems and perform their due duties in this regard.

It asked the enterprises to strengthen copyright management of the content on their platforms to ensure that all copyrighted videos, music, photos and words are published with proper authorization.

Also, copyright holders' complaints and relevant violations should be handled effectively, it required.

The administration said it will also work to strengthen self-discipline in the industry and help promote a cooperation mechanism between organizations of copyright holders and video-sharing enterprises to ensure the healthy development of the industry.

The administration as well as the Cyberspace Administration of China, the Ministry of Industry and Information Technology and the Ministry of Public Security in July kicked-off a campaign against Internet platform copyright infringement, which will last more than four months.