Thread: Dealing with Kindle for PC/Mac 1.19 and KFX in calibre
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Old 10-23-2019, 02:29 PM   #652
jhowell
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Join Date: Nov 2011
Location: Tampa Bay, Florida
Device: Kindles
Quote:
Originally Posted by Timboli View Post
@jhowell - Fair enough .... or should I say, weird enough ... why some and not others ... it's not as if the downloading removes the DRM.
It isn't about DRM. Because KFX is under continuous development, new features are being added over time that only work in certain app/firmware versions. In order to make that work Amazon requires communication with the device downloading a KFX-format book in order to verify that its firmware is compatible. Since "Download & transfer via USB" does not involve communication with the actual device it does not support KFX format. Therefore those books that are only available in KFX cannot be downloaded from the website.

Perhaps at some point Amazon will shift the job of compatibility checking to the device instead of the download server. But that is not how it works now.
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