Ah, the credit card number is part of the encryption/decryption key [1]. Since it seems unlikely that the Nook decrypts the book once and stores a decrypted cop

Ah, the credit card number is part of the encryption/decryption key [1]. Since it seems unlikely that the Nook decrypts the book once and stores a decrypted copy, the Nook also must store the credit card number--or hopefully a hashed version of it. Apparently so [2]. [1] "I cannot unlock my books" at http://www.barnesandnoble.com/u/nook-books-frequently-asked-questions-faq/379003486/ http://www.barnesandnoble.com/u/nook-books-frequently-asked-... [2] http://i-u2665-cabbages.blogspot.fr/2009/12/circumventing-barnes-noble-drm-for-epub.html http://i-u2665-cabbages.blogspot.fr/2009/12/circumventing-ba...