Book activation code is a password provided by a publishing house or e-book platform, which is used to activate and unlock e-books. When users buy e-books, they usually receive a unique activation code. By entering this activation code, users can download e-books to their own devices and gain reading rights. The function of the activation code is to ensure that only users who have purchased genuine e-books can access and read books, thus protecting the copyright and the author's rights and interests. At the same time, the activation code can also be used to restrict the dissemination and sharing of e-books to safeguard the interests of publishers and authors. Therefore, the book activation code plays an important role in the e-book market.