Re: the kfx format, the soon-to-be-released jail-break increases the likelihood that kfx will (eventually) be decoded. Amazon was well aware that the FW might be cracked, and that kfx encoding might therefore be vulnerable to reverse engineering. I wonder if they have allowed for that in their design of the format. The main obstacle to converting it lies in its encoding. How simple would it be for Amazon to simply replace one form of encoding with another?
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