Can I use NetBeans images ( like play.png, pause.gif or refresh.png ) in my programs ?
Yes, you can use the NetBeans images in your programs. They are freely available under the NetBeans License Agreement. More information on it here: http://www.netbeans.org/about/legal/index.html. If you make any changes to the images then you are required to contribute those changes back to the NetBeans community, but other than that there are no restrictions.