If I understand correctly they are ruling you can by a book once, and redistribute the information to as many people you want without consequences. Aka 1 student should be able to buy a textbook and redistribute it to all other students for free.
They may be trying to put safeguards so it isn’t directly happening, but here is an example that the text is there word for word:
patatahooligan@lemmy.world 9 months ago
“Fair use” is the exact opposite of what you’re saying here. It says that you don’t need to ask for any permission. The judge ruled that obtaining illegitimate copies was unlawful but use without the creators consent is perfectly fine.