Online book giveaways raise industry concerns

Publishing industry professionals have expressed concern over a number of online promotions in which copyrighted e-books are being sold for free.

China's largest online bookseller Dangdang.com is in the middle of a sales effort that includes almost all of its e-books being sold for free, from Wednesday to Friday.

Rival Jingdong Mall, announced on Wednesday that it also will offer 50,000 e-books for free.