By their nature, CAPTCHA interfaces require human intervention. As such, it would be impossible to automate the roll-out of a root password CAPTCHA in a Windows update.
However, in a Unix/Linux OS shop, if the network admin employed open source access, to introduce a CAPTCHA for root (install/update) authority, it would become impossible to automate the installation of unauthorized software.
This benefits a secure environment, not large networks where unattended installs are a necessity.
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