Widely used domestic video portals UUSee, VeryCD and Xunlei were recently warned by the National Copyright Administration of China (NCAC) because they failed to supply required copyright documentation for many of the online movies and TV dramas offered on their websites.

The warnings were issued after the NCAC launched a copyright examination campaign last April asking 18 national video websites to hand in lists of their 50 most popular movies and top 50 TV dramas, along with proof of authorization from copyright owners.

In the end, 1,581 movies and TV dramas were submitted, 12 percent fewer than the required number.