Anyone who has actually read a license agreement will understand this. This copyright holds true regardless of whether or not I decide to show you how my program runs, whether or not I show you the source code. Even if I allow you to modify the program using the enclosed source code, it remains mine. If you look carefully, you will discover that some companies try to tell you that any modifications that you make belong to them as well. This is proprietary software, open source or not, and it is something that the FSM emphatically disagrees with.
Free software is quite different.
I designate the software as belonging to everyone . There are a number of ways to do this, but the most often used is copyleft, which is a way to use copyrighting to ensure that the software, and all of the changes and additions, will be kept free from proprietary predators. For all those who want a more indepth explanation of what free software is about, visit the GNU project's philosophy page.