No "avid reader" could recall anywhere near that much text. That takes dedicated effort to commit to memory. Copyright was never meant to stop people copying books anyway, it was meant to stop machines (ie. printing presses) copying them.

Edit: Apologies, I misread it as "100 pages". My point about copyright still stands, though.

I disagree that avid readers cannot complete entire passages from books they've read several times when fed a prefix.

I used to use the initial letters of a whole paragraph from Lord of The Rings as my password.

Some of us have a good enough memory.