Originally Posted by Purple Lady
Nook books cannot be opened by ADE on your PC either, but I guess that shouldn't be a surprise given the DRM they use. It think it is Adobe, but with a different flavor from most.
Sure they can. Are you perhaps using an older version of ADE? They added support for B&N/Nook DRM in version 2.0 (and the 1.8 preview before that).