Depends on the author agreement. With the age of these books, possibly not, but there could easily be a royalty payment involved. Either way, let's assume they

Depends on the author agreement. With the age of these books, possibly not, but there could easily be a royalty payment involved. Either way, let's assume they sell 100,000 copies, that's still not that much money and would be in line with their typical CSR giving (very likely, these authors might have waived royalty for charity too).