There are several different copyrights on the MySQL distribution: 

    1.The MySQL-specific source needed to build the mysqlclient library 
    is licensed under the LGPL and programs in the `client' directory is
    GPL. Each file has a header that shows which copyright is used for
    that file. 
    2.The client library and the (GNU getopt) library are covered by the
    ``GNU LIBRARY GENERAL PUBLIC LICENSE.'' See section L GNU LESSER
    GENERAL PUBLIC LICENSE. 
    3.Some parts of the source (the regexp library) are covered by a
    Berkeley-style copyright. 
    4.All the source in the server and the (GNU readline) library is
    covered by the ``GNU GENERAL PUBLIC LICENSE.'' See section K GNU
    GENERAL PUBLIC LICENSE. This is also available as the file `COPYING'
    in the distributions. 

   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.

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