Are you sure that you have permissions to read that book on devices other than your computer? DE will display the permissions in the "More Info" dialog.
I downloaded the book from eBooks and just assumed I could read it on
a SONY Reader ... How do I get "permission" ...
Adobe's "security measures" have always been extremely frustrating ...
from the huge "keys" to complicated procedures .. which
probably dissuade more users than they prevent fraud ...
I received another email from Adobe Support w. a PDF answer
I don't have a clue how I "authorized" Digital Editions ... I don't
have any email
from Adobe w. an 'authorization code' ...
I don't want to 'de-authorize' Digital Editions if I don't have a code
to 're-authorize' it.
Why does it need to be 'authorized' in the first place?
Dear RICHARD SUGDEN M.D.,
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While it is our software that is enforcing the permissions it is the booksellers (and distributors) that are setting the permissions. If you got a book that is restricted to the device you bought the book on (again check the More Info dialog in ADE), the only way to get more permissions is to contact the bookstore. However since they are setting the permissions based upon their own contractual relationships with the distributors/authors, I wouldn't expect you to have much luck there.
Hard to comment without seeing the full response, but they are suggesting that you do essentially what you've said you already done:
Authorize Digital Editions to your Adobe ID
You said you did this in your first post, but you can double check this by selecting "Authorize Computer" for the Library menu. If you are authorized to an AdobeID it will bring up a dialog saying what AdobeID you are authorized too. If you have never authorized the computer to an AdobeID it will ask you to enter in your AdobeID, however pay CAREFUL ATTENTION to the wording of the dialog and if you get a dialog telling you will not have access to your content on the machine DO NOT PROCEED as you have gotten yourself into a very bad state, and the best solution will be to create a new AdobeID and to authorize with that.
Make sure you have authorized your device to the same AdobeID. Unfortunately there is no good way to check this on the Sony Readers, so to make sure you can deactivate your device (Ctrl+Shift+E), unplug and the replug it and it should bring up a dialog to ask you to authorize the Sony Reader to your current ID.