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for a long time there was confusion here because we had two things called: Jail break.
One (what we still call a jail break) put our (MR dev) signature certificate into the Kindle's certificate store.
The other, updated the Java application keystore, and also installed that *.jar file to "break" out of the Java jail.
Due to that confusion, it got re-named MKK (Mobileread Kindlet Kit - or some such).
Then, since it was almost **always** installed on jail broken Kindles, the "device jailbreak" got expanded to also bundle the Java Kindlet jailbreak and install it at the same time.
History.
= = = =
You will have to sign your Kindlet's jar files (details in that wiki page link above) -
That is where the 'Combined Keystore' thingy comes into play - during the signing.
Kindlets are just *.azw2 documents that drop into the /documents folder so you don't need to create an update_*.bin file for them with KindleTool.
Anything that needs to be model locked and/or will alter the filesystem tree outside of user storage needs to be packaged as an update_*.bin file.
KindleTool will do that for you.
It has the private signature key built into it.
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