Kobo has its own DRM scheme for its own kepub format books, just as Amazon have their own scheme for their own format books.
So if there is any problem removing Adobe DRM, it is still possible to buy from Kobo, download the book using a Kobo device or app, remove the Kobo DRM, and convert to plain epub. Not much different to buyng from Amazon, downloading with Kindle4PC, removing DRM, and converting to epub.
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