Thread: Dealing with Kindle for PC/Mac 1.19 and KFX in calibre
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Old 03-30-2019, 03:21 AM   #545
ilovejedd
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Quote:
Originally Posted by Sirtel View Post
What is the use of that?
Mandatory switch to hardened DRM?

Quote:
Originally Posted by Sirtel View Post
People who don't have wifi must get a downloadable and transferable file from Amazon and the current KFX format is not really either of those things.
Is there anything technical preventing Amazon from replacing AZW3/MOBI in Download & Transfer via USB with KFX files (or whatever new package they might cook up)? AZW3/MOBI are tied to the device by serial number so the encryption of AZW3/MOBI is obviously done on the fly. Afaik, that's the same thing KFX uses for its encryption (pre-K4PC/Mac1.25 and FW5.10.2 at least) and I'm guessing the newest version is likely based on SN as well. I don't believe it'll be difficult at all for Amazon to generate self-contained KFX-based packages on the fly with the updated DRM.

I expect the biggest consideration for Amazon in making such a switch is how many old devices are still in use that cannot be updated to support the new DRM (or format)?
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