This software is licensed to you under the GNU Lesser General Public License (LGPL):

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

Essentially this is what the LGPL license states:

This license allows you to use this software and in addition you may make and distribute copies of this software.

If you distribute copies of this software you may not change the copyright or license of this software. You also have the right to view and modify the source code for this software. If you modify this software and distribute it you are required to license your copyrighted modifications under an LGPL-compatible license and to make the entire source code for your derivation available to anybody you distribute the software to. You also have the right to link this software with other software with different licensing terms and distribute the combined software. In this case you must still license the any derivations you have made of our software under an LGPL-compatible license.

This is just a rough summary of the LGPL license. The actual license can be read at the url above and must be used for any definitive interpretation of the terms of this license.