First of all, general university books are only for teachers and students, and are not open to the public. Also understand that any information is very valuable. For example, many students in engineering universities have used design, although they all feel that they have lost it after using it, but this truth is very valuable in society.

One more thing, especially some confidential documents, I mean technical, not free.

Then, in the online library of the university, only the catalogue search and downloading of CD files attached to some books were realized. You need to know how much it costs to scan millions of books into the computer, including labor costs, maintenance costs and network hardware costs, which add up to tens of millions.

Look at these papers by Douding. Com, all need money to be practical, but it seems that as long as you go to college and start paying for a card, the school library can always borrow it. It's worth running close.