Yesterday, I tried to download an ebook I paid for, and previously put on my Nook, a few months ago. When I tried, I got an error message stating I could not download the book because the credit card on file had expired. But, I already paid for it. Who cares if the credit card is expired? It has long since been paid for, so the status of the card on file has nothing to do with my ability to download said book. I didn’t see anything in the terms of service about this either, but it’s possible I missed it.
This is just one more reason to either not buy ebooks, or strip the drm off of the ones you purchase so you can you the book you BUY on all your devices without having to purchase multiple copies for no reason and have access to something you already bought when you want it.