* Using a single multi-platform API, provides access to USB devices on various operating system. * User-mode: No special privilege is required. * Supports all versions of the USB protocol, from 1.0 to 3.0.

* usbredir was created for use with Spice, which is why it is hosted on spice-space.org, but the protocol and the usbredirhost are completely independent of spice, they could for example also be used to create a vnc extension for redirecting usb devices over a vnc connection to a qemu virtual machine. * The usbguest side is currently only implemented for qemu, and shipped as part of qemu (enabling this in qemu requires the libusbredirparser library to be available when building qemu). * usbredir supports USB device filtering configurable by filter string.