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Originally Posted by Katsunami
You will have to have K4PC installed to be able to use Alf.
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No, you can use Alf for "Transfer via USB" transfers, too.
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Now... let's say Amazon fully converts to KFX for K4PC downloads, and old versions of K4PC stop working. Also, Transfer by USB might delivering AZW3 files because Amazon cannot know for which device you are downloading.
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"Transfer via USB" does know what device the content is being delivered to. Remember Amazon's DRM is locked to a device, not to an account, so when you do a "transfer via USB" you have to tell Amazon's server what specific Kindle the content is being delivered for.
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If this is the case, would it be possible to leave K4PC installed, block the executable from running (just remove your user access rights from it), and then downloading books for transfer by USB and importing them into Calibre, having K4PC installed only to provide the encryption key?
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It doesn't work like that. The encryption key for K4PC is different to that for a hardware Kindle device.
We're really getting too close to the specific details of DRM removal here, where we aren't allowed to discuss.