Could you elaborate on how this ruins the yubikey 4? As a security measure, the software on the YK4 cannot be updated. Therefore, the software in question could have essentially been implemented as hardware. It is hardwired and will never change. I can&#x27;t find the reference, but since there&#x27;s no software update functionality, I&#x27;m under the impression even Richard Stallman would be okay with it under these circumstances.<p>Edit: Found it. <a href="https:&#x2F;&#x2F;stallman.org&#x2F;stallman-computing.html" rel="nofollow">https:&#x2F;&#x2F;stallman.org&#x2F;stallman-computing.html</a><p>&quot;As for microwave ovens and other appliances, if updating software is not a normal part of use of the device, then it is not a computer. In that case, I think the user need not take cognizance of whether the device contains a processor and software, or is built some other way. However, if it has an &quot;update firmware&quot; button, that means installing different software is a normal part of use, so it is a computer.&quot;<p>Straight from the big GNU&#x27;s mouth.