Quote:
Originally Posted by rkomar
@dgatwood: The upshot of all that work is that you have the key for _one_ ebook of yours. You will have to repeat the procedure for all the rest. It is not uncrackable, but it raises the amount of effort required. For many, it will be too much.
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Oddly enough, both Amazon and Kobo have per-book encryption keys. Amazon's scheme is based off a device-level key, so isn't exactly what you describe, but Kobo's scheme is precisely one key per book, key provided to the Kobo desktop reading software over the internet.
But all the keys must be stored by the reading software, to allow off-line reading. So it's just a question of getting access to the app's key store and reverse engineering the encryption scheme. [
software name deleted].