If you're based in the US, you should be able to install most of the active content officially available online at Amazon. If you live anywhere else, you won't be allowed to install anything, not even the free apps or games.
BTW, many of the people in the dev corner had applied (even multiple times) to officially get access to the Kindle Development Kit, but as far as I know, in none of the cases did Amazon even bother to reply. So we're just doing our own "unofficial" stuff on jailbroken devices.
There must be some reason why Amazon does it this way, but the logic is beyond me.
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