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Suggestion,
Just go ahead and import them into Calibre.
Try to run a plug-in like Count Pages (do just the word count) or Polish (must be epub or azw3 format). These do not work on DRM'd files so when you try to run it, only the non-DRM'd will work. The other will be obvious from a non-returned count.
It really is a quick way to check many at once. It's your choice what to do after that from deleting to tagging as DRM'd or whatever.
You may know this, but just in case...
Idealy, use either a different library to import OR create a virtual library. Open the virtual tab and import books there. Add a temporary tag based on the virtual library such as *TEMP or something so they are easily isolated until you do what you will.
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