In my opinion, using the x-fsn header in an application that actually enhances the kindle, like building a better web browser that works on the kindle, is acceptable use. Using the x-fsn header to download unapproved files, or to export amazon 3G service to a non-Kindle computer (tethering) is unacceptable. Tools like corkscrew that supply 3G service to any application or external device fall into the second (unacceptable) category. You should build x-fsn support into each application that needs it, and follow the amazon rules about what content may be downloaded by their webkit browser. Of course, Wi-Fi access should bypass the amazon proxy and use the local Wi-Fi connection, to download unrestricted content. The application must be "3G-aware" and follow the rules when it uses 3G.
At least, that is my opinion. Just remember the Golden Rule here, and behave accordingly...
Thanks.
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