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Why can't the books of the National Digital Library of China see the full text on the Internet and can't be copied?
Due to copyright reasons, books in China Library are only allowed to browse the first 24 pages of each book online. And there is strict protection for reading and browsing. It's not that you can't copy, but there are strict restrictions on the amount of copying.

Books in China Library cannot be downloaded. E-books can only be downloaded after downloading the Appaby reader by logging in with the reader card number of Guo Tu.