Licensed under the BSD License.
http://creativecommons.org/licenses/BSD/

In summary:

You are free:

    * to Share — to copy, distribute and transmit the work
    * to Remix — to adapt the work

Under the following conditions:

    * No Endorsement. The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission.
    *
    * You must retain the license terms and copyright notice in any source code distribution and reproduce them in documentation for binary distributions.
    * Any of the above conditions can be waived if you get permission from the copyright holder.