I recently added Maverick to my Mac Safari and downloaded a book to Digital Editions 2 on my computer. I downloaded the book to my Kobo but Kobo will not allow me to open the book. It says it belongs to Digital Editions and says something about my passwor

I recently added Maverick to my Safari and downloaded a book from the library to Digital Editions 2 on my computer. When I downloaded the book to my Kobo, Kobo would not allow me to open it saying it was owned by Digital Editions and saying something about my password. Do I need to change to Digital Editions 3??