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I don't think there's any automated way to see which books still have DRM or not. If you can open the book with Calibre's viewer, then there's no DRM.
You could sort by date for those books you know you added prior to adding Alf's plugin and assume those still have DRM. Then just drag the original book on top of the description pane in Calibre and that should replace the current same format of the book with a new copy that has the benefit of Alf's plugin.
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