Quote:
Originally Posted by haertig
So tell me, when I use the alternate method of download, "Download for USB Transfer" and I specify to download the ebook for my PW3 (which understands KFX), why does it deliver me a KF8 ebook? Seems like it could deliver a KFX ebook instead, but it doesn't. At least I think what it is delivering is KF8 (it's a single file that ends in azw3). I'm thinking it's KF8 because of the ability of the DeDRM plugin I installed in Calibre years ago to remove the DRM easily. I'm not complaining, but I'm wondering why they aren't delivering KFX.
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KFX format is never made available for USB download. It is only delivered directly from Amazon to Kindle apps and devices. At least so far.
As j.p.s mentioned one reason is that KFX books are split into multiple files. That could be gotten around by Amazon, but so far they haven't done so.
Another reason is that KFX format is under continuous development and has changed over time. Whenever a KFX book is sent to a device the server checks which KFX features the device firmware supports and only delivers KFX that the device can handle.
Another possible reason is that it encourages users to keeps their devices online in order to receive the Enhanced Typesetting that KFX enables. Amazon benefits from that, with the ability to collect usage data and deliver ads to devices.
I suspect that Amazon's long term strategy might be to phase out the older formats. That would explain the lack of attention to the long broken DRM of the older formats and the immediate fixing of KFX DRM whenever it is compromised.