I was able to authorize and move Sony ebookstore epubs (re-downloaded versions of my purchased LRX formatted ebooks with DRM that were re-downloaded as DRM/Protected ePubs) over to my Nook on my second attempt. But it did work (first attempt failed I think b/c I had registered ADE on one computer to a new/unrelated account different than my Sony Connect account).
When you install the Sony Reader software on a new computer (or maybe after wiping out the old version by uninstalling and removing your old DRM authorizations for that program), it also registers you with Adobe with an account with the same email address and password as your Sony Reader account.
See the post below for how I got it to work:
https://www.mobileread.com/forums/sho...6&postcount=12
Good luck,
Dave