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With your help, we'll launch free software to new frontiers! This diagram, originally by Chao-Kuei and updated by several others since, explains free to the public
different categories of software. In particular, this means that source code must be available. There are many different ways to make a program free—many questions of detail, which could be decided in more than one way and still make the program free. Some of free to the public
possible variations are described below. For information on specific free software licenses, see the license list page. Free software is a matter of freedom, not price.