You can compare an official genuine book with a pirated book. First of all, some people are interested in colors. Your officially published book is brightly colored and has no noise at all. But your pirated books must be copied by others before they can be blended and printed. The color is obviously particularly dirty, and there are variegated colors. The quality of paper should be different, especially when looking at the cover. Now you can see if the words in it are misspelled. Once these problems appear, it shows that the book is pirated and the printed handwriting pattern is not blurred. If it is vague, it also proves to be piracy. Printing pictures is extremely important. If it is an official genuine book, the printed picture is particularly beautiful and bright, even if it is black and white, it can be seen more clearly. If it is pirated, the picture is particularly blurred, colorful and not clear at all. Now, in order to prevent books from being tampered with many times, some books have enabled RMB anti-counterfeiting lines, so that it is more obvious to know whether the books are printed by the official printing house. Private people don't have that kind of book paper with RMB security line, which shows the authenticity of a book.