and TI/Casio/HP would quickly resent such a decision too, given that an instance of the well-known Streisand effect would attract much attention to their weak platforms, and if the right persons work on the matter, all platforms would fall in a matter of hours (at worst, days). In fact, banning the open NumWorks calculator but not models from TI, Casio and HP would be a PR disaster for whatever standardized testing regulation authority dares making such a blunder. There's no reasonable way to ban the NumWorks calculator while leaving the more usual commercial models from big, well-established manufacturers untouched. On all of those, the exam mode can be easily tampered with - the manufacturers' only protection is that the ones with a technical ability to tamper with the exam modes hold themselves to moral standards. The HP Prime, TI-84+CE / TI-83PCE, and at least the two Casio models sold in France as Graph 35+E and 75+E aren't more secure than the NumWorks calculator. Try to find another calculator where you can independently audit its exam mode and not just blindly trust the manufacturer. But I'll just say this: you can download the firmware of a NumWorks calculator in DFU mode, compare it byte-for-byte with a reproductible build of its source code and prove you did not tamper with exam mode even with a homemade customized firmware. I'll spare you the argument why exam mode is a dumb idea.

The whole point of this project is empowering calc users with freedom to modify their calculator firmware and run whatever firmware they want. I haven't heard the French Éducation Nationale freak out about a completely unlocked calculator from frakking HP. The only practical difference in killing its exam mode when compared to NumWorks would be the amount of reverse engineering to perform on its closed-source firmware. Heck, I've demonstrated bare metal LED blinking in 2015, a dumb third-party RPN calculator firmware in 2016 and somebody ported the Linux kernel this week. The HP Prime hardware does not offer any root of trust capability and has no flashing restriction. There's no reason why it wouldn't work on hardware. I've already nuked the exam mode on the simulator with a single line comment.

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