problems with drm on my kobo

Hi, there are 2 years that I buy e-books to read on my sony reader without problems. I have bought a kobo. It's impossible to read my books on this new reader cause of the drm !

I also use another computer (PC) with the new adobe digital editions ... Maybe it's wrong, maybe I need an old version?  I have paid for these books and I want to read it .

I thank you for your help