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Re:Kindle, ePub, and Amazon’s love of reinventing wheels by unhammer on Wednesday May 18, 2022 @03:50AM (#31420255)
KOReader reflows pdf's for ereaders using k2pdfopt, see https://www.willus.com/k2pdfopt/

Kindles need to be jailbroken to use koreader, and Amazon apparantly makes that harder with each device :-/

I have this as a right-click action for files matching *.pdf in my file browser (thunar):

    k2pdfopt -ui- -dev kp3 %F
So if I right-click on a pdf I can immediately reflow it into a kindle-readable version.

(%F is the quoted file name, in your terminal you would `k2pdfopt -ui- -dev kp3 'something.pdf'`)

Re:Kindle, ePub, and Amazon’s love of reinventing wheels by innocenat on Wednesday May 18, 2022 @04:06AM (#31420327)
> Amazon apparantly makes that harder with each device

Alternative phrasing: Amazon is continuing to fix security bugs in Kindle device.

Re:Kindle, ePub, and Amazon’s love of reinventing wheels by stkdump on Wednesday May 18, 2022 @04:22AM (#31420408)
What threat is the security for?
Re:Kindle, ePub, and Amazon’s love of reinventing wheels by innocenat on Wednesday May 18, 2022 @05:33AM (#31420743)
The technical detail about latest WatchThis hasn't been published yet, but the previous KindleBrake seems to be using malicious JXR image payload via built-in browser. That sounds like pretty serious security flaw to me.