Look in the "Purchased" section of your library on the Kobo site for ePUB versions of books that have them. You will see a button "Adobe DRM ePUB". I have not bought from other Kobo affiliated stores so I don't know if the same is true there.
Both the Kobo kepub books and the Adobe DRM books are ePUB. The difference is the flavour of the DRM. Kepub books are ePUBs with Kobo's proprietary DRM. The Adobe ones use their own proprietary DRM.