About- "Free software" is a matter of liberty, not price. To understand the concept, you should think of "free" as in "free speech", not as in "free beer". Free software is a matter of the users' freedom to run, copy, distribute, study, change and improve the software. --[GNU Project]
Copyleft- Copyleft says that anyone who redistributes the software, with or without changes, must pass along the freedom to further copy and change it. Copyleft guarantees that every user has freedom. --[GNU Project]
Copyright- Copyright is a form of protection provided by the laws [...] to the authors of “original works of authorship”, including literary, dramatic, musical, artistic, and certain other intellectual works. --[U.S. Copyright Office]
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