Using the Kobo desktop app is almost identical to Kindle with regards to DeDRM. You open app, you download book in app, you open Calibre, then here is where it changes, you click the Obok plugin on the Calibre toolbar, find book and import and get an ePub and you don't even have to convert it!

ACSM is Adobe's crap and the same thing you'd have use for Google Play Books and a few others. It's again another slight step change where you have to open the ACSM with ADE to get the book in the first place. WTF Adobe did it that way, IDK but they did.