The only one of Bradbury's books I've read is Fahrenheit 451
And that was a long time ago, so I'm a bit hazy on the details: a future society where it's against the law to own books. Books are dangerous! Full of ideas which might give the people who read them ideas!
Most books have been burnt or destroyed. The object is to remove them all forever.
If I recall correctly, a group of (book lover) subversives are committed to memorizing the entire contents of particular books ... for posterity.
A brave & extremely
risky thing to do, with the police forever trying to track them down.
That's about all I can recall, but I do remember enjoying it immensely at the time.