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Originally Posted by Purple Lady
I thought that for Nook hardware and Nook apps at least that wasn't true. I don't have any hardware and don't use their apps often so I don't know.
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Barnes and Noble bought Fictionwise and get the encryption scheme that uses a name and number as a base for the encryption key, meaning that DRMed ebooks could be used on any device independently of any central server, so long as the name and number were known.
They now seem to have decided that this kind of encryption is a bad idea, and have changed things so that an encryption key is used that does not seem to be based on name and CC#, but is possibly random.
They can do this because all their own software and devices obtained the encryption key from the B&N server, and so it's just a case of sending a different encryption key at the next opportunity. It was only third-party software using the ADE kit that required the user to enter their name and CC# manually, and that will no longer work.