Just learned about this tool and it looks pretty cool. Go over here for more infomation: http://usbip.sourceforge.net/
The project is released under a GNU GPLv2.
You can browse the source code here: http://usbip.svn.sourceforge.net/viewvc/usbip/
Also can get it via svn co https://usbip.svn.sourceforge.net/svnroot/usbip usbip
I’ve only just read a little bit about it but it looks like it’s written c++ or c. The source’s included read me has some good information if your willing to read it.