The Adobe DRM from Kobo, Google Play, Sony (and many other places) is different from the DRM schemes for Nook, iBook, and Kindle. Each of them has their own proprietary encoding. If you are using a Nook with its DRM scheme already, you will not be able to use the "other" one too with the ADE software (and yes I know that this is theoretically not an issue, but it simply doesn't work). That is one reason why people remove DRM from books before loading them onto their readers.
Talking about DRM removal is not allowed here, but a google search on Apprentice Alf will help you out.
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