Your Kindle reads DRM-free MOBI. So you don't need your K3's PID for ebooks from non-Kindle sources.
There are two ways to download from the Kindle Store to your PC. The first is to use Kindle for PC, and the 2nd is to download a version for your Kindle 3. The advantage of the K4PC approach is that you don't need any extra info to strip the DRM.
Note that Calibre can manage your ebooks even if they still have DRM, but most modifications to the ebooks require the DRM be stripped.
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