Sounds like a good reason to stick to classics in such groups.
Seriously, if I knew about such a stipulation, I'd be incentivized not to buy copyrighted books to read for a book club in the first place.
I'm really glad there is a corpus of public domain works; so much good is possible (or positively incentivized) because of it. Too bad it isn't growing much (e.g. Steamboat Willie is still, still under copyright restrictions nearly 100 years later).
Seriously, if I knew about such a stipulation, I'd be incentivized not to buy copyrighted books to read for a book club in the first place.
I'm really glad there is a corpus of public domain works; so much good is possible (or positively incentivized) because of it. Too bad it isn't growing much (e.g. Steamboat Willie is still, still under copyright restrictions nearly 100 years later).