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It's the most obvious question, but I will ask it just to be sure:
Are your reader and your pc activated with the same Adobe ID?
If not, you should be care full how you proceed. If you re-activate one of the devices with the Adobe Id of the other, you will lose the content of the then inactive Id.
If your devices use the same Adobe Id, take a look into the folder structure on the reader. On my reader there is a folder called some thing like 'Digital Edition'. The ADE version on my reader can only read DRM protected files that are in that folder. Maybe your dropbox download put your file in the wrong location on your reader.
If this don't work, I'm sure some forum members more knowledgeable about Sony devices will show up and make more suggestions.
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