Public Domain is not protected by copyright law because the copyright has expired, the work was created using public money, or the creator donated the work to the public domain.Example: Classical Music because the copyright has expired.
Copyright work that you can use, copy, or give away for free.Example: ITunes, Safari, Google
Use copyrighted work for free but only for limited time.Example: Promo Apps
All Rights Reserved
Only allows purchaser to use software according to the details in the license agreement.Example: Microsoft
Software that includes the source code so someone can improve it.Example: Firefox and Chrome allows user to improve software.