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In order to deDRM a file, you need the PID it was encoded with/for (if the file is valid for several PID, I guess any single one of the PIDs is enough, but I don't know).
Some mobi files are encoded with no PID (demo and free books), those can be deDRMed without a PID. But if the file was created for an unknown PID, you can't decode it, as far as I know (unless you use brute-force guessing).
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