1. Are you sure the book is DRMed?
2. If it is, I understand that to encode the book so particular device can read it, they need to encode it with PID of this device. Since you didn't get asked about the PID, it might be as pdurrant says, that they send you the unencoded book, and Mobipocket Reader encodes it on your computer. But it also needs the PID to encode it.
So:
- if you can read it in Mobipocket Reader, maybe you can get the information about its PID off it? or
- maybe you can give it a PID, any PID, and get it to re-encode the book with it? Then you'll know which PID it's encoded with, and can run the script.
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