Thread: KFX Format
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Old 08-11-2015, 01:32 PM   #4
jhowell
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Join Date: Nov 2011
Location: Florida
Device: iPad Air 2, Kindle PW2, Nexus 7
Some interesting strings from inside a kfx book:

{key:"kfxgen_package_version", value:"PackageVersion:YJReaderSDK-1.1.67.2 Month-Day:06-18"},
{key:"kfxgen_application_version", value:"6.24.1.0"}

From this I'm guessing that Amazon has a kfxgen tool that they use internally to produce these files.

ETA: Perhaps this will become available more broadly if Amazon updates their Kindle Previewer tool to support enhanced typesetting.

Edit 2: Another interesting thing is that the DRM strings are present in the file even for supposedly DRM-free books. It looks like Amazon may be treating this new format as more proprietary than their older ones.

Last edited by jhowell; 08-11-2015 at 03:00 PM.
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