The information about the license
The code is distributed under LGPL 2.1 license.
The the full text of the license please refer to GNU website: LGPL 2.1
In short:
1) yes, you can to use the library as is in any kind of the software, including commercial software.
2) no, you can not create private derivatives of this library or make a changes in the code for the purpose of your product and keep them private. Any changes introduced into the library must be published under the LGPL or more permissive license.