Originally Posted by mitja_i
I understand that mobipocket reader also allows more than 1 device? They don't use online accounts but if you connect your friends device on your computer where you have drm books, he can read them on his device also?
No, that's not exactly the way it works. Every Mobipocket device has a unique identifier called a "PID" (it's a 10-character alphabetic string). In order to allow your friend to read a book that you've bought, you need to go to the website where you bought the book, enter your friend's device PID, and redownload the book, encoded for that PID. A book can be encoded for up to 4 different PIDs at most Mobi stores.