If it says not authorised then it has DRM protection and, to use it, your computer and eReaders need to be registered/authorised... I think that Nook DRM content may use different version of ADE to anyone else and is not compatible with having DRM stripped...
Sorry can't be more helpful, it's around 1.00am here and I'm on the way to bed... someone else in the US should be more awake and helpful...
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