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Originally Posted by lkmiller
They truly do want to go out of business. Having the more flexible DRM was really their major attraction (at least for me).
I don't know if changing the expiration would effect things. I had two credit cards on my account. When I switched the default from one to the other, I had no problems. When I added a new card and made it the default, that's when I could no longer unlock new downloads. Afterwards I switched my default back to the original and deleted the new card, but it still didn't work.
I've unzipped and inspected copies of the same book downloaded at various times, and now the encryption key never changes no matter which card is currently default.
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The expiration date would not be part of the hash. If you look at what you are asked to unlock the book, in a reader or other tool, you will not be asked for the expiration date.
I always had to re-download the ebooks to get a file that unlocked with a newly added CC#. The older downloaded file still unlocked with the card data that it was purchased with. So far my current purchases are unlocking with the purchase details shown for the order number. The new purchase details show the name with my middle initial dropped, from what is on my card and what I typed in at the original purchase using that card.
Luck;
Ken