After following the instructions I have noticed that this blog (http://apprenticealf.wordpress.com/2011/01/13/ebooks-formats-drm-and-you-%E2%80%94-a-guide-for-the-perplexed/)   does not address the issue of multiple credit card numbers for my books ( have a Pandigital and I have ordered my Nook Books with two different cards)  I was wondering if any one could shed some light or suggestions on the issue.  Please and thank you.