Hm. That would seem to indicate that the PIDs associated with an Amazon account are all encrypted into the file on download. So they're using a modification of Mobi that allows multiple PIDs per file.
How does that work with regular Mobipocket books? If you download a version to read on your PC, but then you add another device, do you have to download again to get a version with both the PC and the new device in the PID part of the file?
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