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The latest versions of GRIB API are released under:

Previous versions of GRIB API were released under:

 Licensed under the GNU Lesser General Public License which
 incorporates the terms and conditions of version 3 of the GNU
 General Public License.                                                                                    
 The texts of these two licenses can be found in

http://www.gnu.org/licenses/lgpl.html

http://www.gnu.org/licenses/gpl-3.0.html