Copyright is a collection of rights granted to the author of a piece of work. (Books, Songs, Videos, Software.)
Public Domain isn’t protected by copyright law. Copyright has expired, the work was created using public money. The benefit is that the creator donated the work into the Public Domain. Example: Shakespeare and Beethoven.
Copyright work that you can use, copy, or give away for free. The benefit is that its free. Example: Adobe Reader and Skype.
Copyrighted work that is similar to freeware, First it is free but later on you must pay for full use or upgrades. The benefit is that it offers a free trial. Example: Minecraft.
All Rights Reserved
May be used by the purchaser according to the exact details spelled out in the license agreement. The benefit is that you must have permission to do anything but what is in the license agreement. Example: Google Chrome.
Software that includes the source code with the idea that someone can approve upon it. The benefit is that they are an open source. Example: Firefox.