With Adobe DRM there is a way to `gift' an ebook:
1. Buy the ebook. When you download the book, you don't get an epub of pdf file, but an acsm file (often URLLink.acsm). Now this is the tricky point: Don't open this file with ADE or Sony Reader library but save it as a file. This file is a ticket to download the real book but it is not yet tied to a particular Adobe ID. Your account at the bookshop doesn't know your Adobe ID.
Now send this file to the intended recipient. When they open this file with ADE or Sony, the real ebook will be downloaded and tied to their Adobe ID. The acsm file (or rather the information in it) is then registered to have been used so you can't use it on a second Adobe ID.
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