Expiry date on ISBNs?
Suppose I buy 100 ISBNs. Is there an expiry date on these ISBNs? What happens if, a few years later, the ISBN format changed (the way it changed from 10 to 13) and I still have 50 of the old ISBNs? Can I exchange them for new ones at that time?
I can see each book taking 3-4 ISBNs (paperback, hardcover, e-book), and if it has 4-5 editions, I cross 20 ISBNs. So it may make sense to buy 100, but I would want the ISBNs to last for over a decade.