Originally Posted by geertm
The great thing about the B&N DRM is that after downloading a book you do not need an DRM server anymore. The encryption is completely enclosed within the ebook file. Even if B&N would not exist anymore, you would still be able to read your books with any device or program supporting the DRM.
That's also true of Amazon's DRM. However, if B&N or Amazon went out of business (or decided to stop supporting that particular form of DRM), there would be no way to get a new device or application that would be able to read your books.
According to bgalbrecht earlier in the thread, this has already happened with B&N's Fictionwise/eReader subsidiaries.