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The external card is not considered part of the device, therefore can't really be taken into account for DRM authorization, which is tied to the device when you create your Adobe Digital Editions account (you'll note if you use ADE that it won't let you drag & drop to your card, only to the Kobo itself; ADE also won't show anything that wasn't added to the device by the program itself).
If you want to transfer those books to a different device, you'll have to hook that device up to ADE, authorize, then drag & drop 'em from the ADE interface.
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