WorldGuard protects your Minecraft server. As Minecraft's oldest surviving world protection mod, you know you're in safe hands.
You need to have Maven installed (http://maven.apache.org). Once installed, simply run:
mvn clean install
Maven will automatically download dependencies for you. Note: For that to work, be sure to add Maven to your "PATH".
We happily accept contributions. The best way to do this is to fork WorldGuard on GitHub, add your changes, and then submit a pull request. We'll look at it, make comments, and merge it into WorldGuard if everything works out.
By submitting code, you agree to place to license your code under the GNU General Public License v3.