Thank you for help in my getting my head round what will be the first of many challenges no doubt.
So - given that I downloaded the Adobe Digital Extension (ADE) software first, the only reason that the Sony software was useful was to download the free books. As these free books are not protected by Digital Rights Management (DRM) I can view them using the free viewer in calibre?
The books I bought (Dragon Tattoo etc) are protected by DRM so they cannot be viewed by calibre. And given that they can be viewed through ADE, then Sony Reader Library can be safely uninstalled?
But of course they are all safely on my prs-600 so don't really need to be viewed on my pc at all, but can be should I so desire.
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