Apple Sample Source Code License
You may incorporate this Apple sample source code into your program(s) without restriction. This Apple sample source code has been provided "AS IS" and the responsibility for its operation is yours. You are not permitted to redistribute this Apple sample source code as "Apple sample source code" after having made changes. If you're going to re-distribute the source, we require that you make it clear in the source that the code was descended from Apple sample source code, but that you've made changes.