I don't have a new Kobo reader, so I can't check this, but it may be that the kepub renderer uses webkit, but I'm pretty sure any renderer that understands Adobe DRM has to be using the Adobe renderer. That's what I was told a couple of years ago.
I'm not sure how to create test cases for this either, without going through Kobo's Writing Life and getting both the kepub and DRM'd epub to check and compare.
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