Strange. Yubico&#x27;s <i>dainnilsson</i> is usually quite forthcoming with responses to questions, but his final response in that GitHub thread worries me (he seems harrowed). I am genuinely curious what reason there could be not to open-source the code. I am not expecting any trade secrets in there; any competitor&#x27;s biggest challenge by far is getting the hardware right and getting an assembly line going.<p>On the other hand, keeping the code closed does garner a lot of distrust.