libusb is covered by the LGPL:

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.

----

Alternatively, the files usb.h.in and/or usb.h may be licensed under the
BSD license:

Copyright (c) 2000-2003 Johannes Erdfelt <johannes@erdfelt.com>
All rights reserved.

Redistribution and use in source and binary forms, with or without
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1. Redistributions of source code must retain the above copyright
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