Look at the appearance. The overall feeling of genuine books is that they are neat, straight, and generous

The paper quality is good. Paper is also divided into good and bad. Genuine books are all good paper, slightly heavier.

Look at the clarity. When you open the genuine book, the handwriting is very clear, and the ink is sprayed very evenly

Look at the marks, most of the genuine books have anti-counterfeiting trademarks

Error rate. Pirated books have too many typos and a high error rate

Piracy

Piracy refers to the copying of works and publications without the consent or authorization of the copyright owner. The act of making a copy that is identical to the source code by a new manufacturer and redistributing it. In most countries and regions, this behavior is defined as an illegal act that infringes on intellectual property rights, and even constitutes a crime, and will be punished by the country where it is located. Pirated publications usually include pirated books, pirated software, pirated audio-visual works and pirated online knowledge products. Piracy, also known as "D version". This violates the law and buyers cannot get legal protection.