@JSWolf - only just realised looking at your log that you were trying to use a *different* Modify ePub option on that DRM'd ebook. Had you just selected the new "Insert or replace cover" option, then you would have got the error message telling you it could not do that.
Instead you chose (amongst other things) the "Remove Adobe xpgt files" option. Clearly that also needs to have added to it the same DRM check to tell you that it is not possible to apply to this book, so its an old bug. I'll make sure that is sorted for the next release.
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