If you look at the bottom of the page you linked:
As you can see, this book is listed as "Senza DRM" (DRM-Free on the English language site).
You'll also see books with Adobe DRM such as "Mitologia classica"
With the current design you can not tell while shopping at store.kobobooks.com directly. In fact some authors have taken to claiming in their title so you can be aware. Tales for a Dark Night--Book 1--an Archon DRM free anthology of horror. You should not rely on a publishers listing of DRM status, while researching for this answer I found ...
Absolutely, yes. I was a Kobo customer long before I had a Sony reader. I switched to Sony when my Kobo Touch died. I was actually happy that the Sony store was killed because it resulted in the Kobo store being put on my Sony reader.
You need the latest firmware update (or at least since the Kobo rollover), and then you will have a "Kobo Bookstore" option ...
Yes. Once you've purchased the book, you can go to "My Books" and find the one you want to download. Below the thumbnail of the book cover there is a "..." menu which looks like this when expanded:
Click "Download" and you'll be presented with a dialog:
Now you can load the downloaded epub on any reader you like.
The problem is definitely with Adobe. They have this thing called DRM (Digital Rights Management), that's essentially a layer of protection that's supposed to minimize the amount of book piracy. Essentially, when you buy a book with DRM (as opposed to DRM-free), you are not downloading a .PDF or .EPUB file, you are getting a .ACSM, which is Adobe's ...