Solution:
Visual cover
Look at the cover first, which can be observed from the aspects of color, clarity, cover paper quality, book paper quality, book binding and so on. Specifically, pirated books generally have bright cover colors and muddy handwriting. The cover paper is thin and the offset glue overflows. Hardcover books may lack a plug cloth (plug cloth: silk cotton strip cloth with a tightly woven ridge at one end). Stick it on both ends of the spine to protect the spine incision and increase the aesthetic feeling of the book. ) or without front and rear ring linings.
See if there is a bar code and pricing on the back cover. If there is no barcode, it must be a pirated book. (See below for special circumstances)
Audit text
Of course, as we all know, you can turn over a page and read a paragraph carefully. If you find a lot of typos, you can basically judge that the book in your hand is pirated. This is the method that most people are using to identify pirated books, and it is also the most intuitive method.
There are actually many aspects. For example, whether the font size of chapter titles is uniform, whether the handwriting is clear, and whether the book block paper is suspiciously thin (except dictionaries and art books, the writing paper used for book blocks is about 55 grams). There are also some photocopied pirated books. Although there are no typos, it is inevitable that the typesetting density is inconsistent or the distance between the head and the foot is not uniform. Of course, there is a pirated book called high imitation, which is exactly the same as printed genuine books. Generally, this kind of book will not be very popular in the market, and the booksellers will directly supply it to major trainings.
Look at the copyright page carefully
The copyright page is usually on the back of the title page, or at the end of the text, with CIP data printed on it. It is relatively simple to check whether the ISBN of the copyright page is consistent with the barcode on the back cover, and the inconsistency is generally piracy. There are also inferior pirated books with no copyright pages at all. Exclude the case that the copyright page of a set of books is divided into several volumes, and the barcode is in the first volume or the last volume, but at this time the set of books must have the same title and ISBN.