The
json-simple library is Apache licensed*, and Amazon uses the unmodified original source code... (At least on all devices I've seen so far, i.e. K3-KPW). In other words, there is only an infinitely small chance for the "augmented" file breaking a DX.
(*)Which is also the reason why the uninstaller can simply include the "original" jar, and one of the reasons why the jailbreak ended up being implemented there.