1, weight: the original book and the imitation book have different weights, and the original book is made of ordinary paper; Pirated books are made of inferior paper and have a light weight.

2. Printing: Genuine books are beautifully printed and brightly colored; The printed color of pirated books is rough, dim and even fuzzy.

3, price: genuine books are sold through formal channels, with high cost and high price; Pirated books have few business links, low cost and much lower price.