It all comes down to FORMAT, FORMAT, FORMAT..
If these are books that you have downloaded via Adobe Digital Editions (ie the acsm file from the web site that in turn downloads the ePub) then yes; you CAN add the book to Calibre, but since it has DRM in it many of the Calibre features will not work,
On the other hand, if it is the so called "kePub" format then no; you can't do diddly with it.
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