All source code created by the NCO project and distributed with NCO is
re-distributable under the terms of the GNU General Public License
(GPL) Version 3. The full license text is at 
http://www.gnu.org/copyleft/gpl.html and in the file COPYING. 
Copyright information is in the file COPYRIGHT.

As a special exception to the terms of the GPL, you are permitted 
to link the NCO source code with the HDF, netCDF, OPeNDAP, and UDUnits
libraries and to distribute the resulting executables under the terms 
of the GPL, but in addition obeying the extra stipulations of the 
HDF, netCDF, OPeNDAP, and UDUnits licenses.
   
This program 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 General Public License for more details.