In fact, the principle of pirated books is to scan the original books, and then use the relevant text recognition system to restore the scanned words into images one by one. Because of algorithm problems, there will naturally be some word recognition errors and typos.

As a pirated product, the pursuit of seizing the market of genuine books in a short time, illegal publishing houses have no mind to check, and naturally download Chinese characters recognized by images directly to the printing house, that is, the way you get them.

Extended data:

The method of judging pirated books:

1, read the cover first. It 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.

2. Review the 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, the font size of chapter titles is uniform, the handwriting is clear, and the book block paper is thin (except dictionaries and art books, the book block uses about 55 grams of writing paper). 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.

3. 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.

4. Accumulate experience. The accumulated experience here refers to the experience about copyright. Many pirated books steal the names of remote publishing houses such as Inner Mongolia Publishing House and people in Xizang Publishing House, making it difficult to transmit information. In fact, these publishing houses generally only publish books translated from Chinese into minority languages, and the total categories of books published are very limited because of the relatively backward culture.

Pirated booksellers don't know much about copyright information, and pirated books often use the names of several publishers. There is also a whole set of books with different titles using the same book number. These books are illegal, if not pirated.