You can read books from Sony on both readers, but B&N books only on the Nook. Newer versions of the ADE SDK have support for B&N's DRM schema, but Sony infamously uses outdated versions.
As far as things typically go, you install ADE, open it up, and connect the reader you want to authorize. When connected it will ask you to authorize.
The following is from the Adobe help guide:
Quote:
Connect the supported eReader device to your computer and launch Digital Editions. Digital Editions automatically detects the presence of your device and offers to authorize it with your Adobe ID. If you have not authorized Digital Editions with your computer, you will need to complete that first (Digital Editions guides you through that process: View the Activation and Authorization topic). Both Digital Editions and the device must be authorized to be able to transfer protected content to and from the device. Unprotected content can be transferred to and from the device without authorizing either the device or Digital Editions, but Adobe strongly advises authorizing Digital Editions as it gives you content portability for your protected books, whether on Digital Editions or the supported device.
After authorization, the device appears as a new bookshelf in your library. You can transfer items to and from the device's bookshelf just as you do with other bookshelves in your library. You can read books that are on your device or your own computer. You can even read books off a friend's device (though you cannot transfer books from that device to your computer or vice versa).
Important: Do not disconnect the device while transferring library items to or from your computer.
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