A is a software-based abstraction layer that emulates physical Universal Serial Bus (USB) controllers within an operating system. Instead of relying on physical USB ports, the virtual bus creates a simulated environment where the OS believes a USB device—such as a hardware security key (dongle)—is plugged in, even when it is not physically present.
: Windows may block the driver because it lacks a valid digital signature or its certificate has been revoked. mastercam x72022 virtual usb bus