2. Publishers are different. After being authorized, genuine books can mark their own company as a publishing house on the book cover. Photocopying can only indicate the book publishing house authorized by audio and video.
3. Book price. Because of the cost of copyright authorization, the price of genuine books is higher than that of photocopies.
4. Books are classified differently. Genuine books are generally authorized by the original author or typesetting. Most of the copies are English books or ancient books, and the copyright of ancient books cannot be obtained from the original author.