| Briefly stated, the terms “free software” and “open source software” refer to software products distributed under terms that allow users to:
Use the software Modify the software Redistribute the software
in any manner they see fit, without requiring that they pay the author(s) of the software a royalty or fee for engaging in the listed activities. In general, such terms of distribution also protect what the publishing world calls the “moral right” of the software’s author(s) to be identified as such. Products such as the GNU/Linux operating system, the Apache Web server, the Mozilla Web browser, the PHP programming language, and the OpenOffice productivity suite are all well-known examples of this kind of software.
More detailed, formal definitions for the terms free and open source are maintained—and vigilantly watch-dogged—by the Free Software Foundation (FSF)1 and Open Source Initiative (OSI).2 However, the definitions are substantively identical, and the decision to use one of these terms rather than the other is generally ideological, rather than functional; the FSF prefers the use of a term that explicitly refers to freedom, while the OSI believes that the dual meaning of the English word “free” (gratis or libertas) is confusing, and instead prefers the emphasis on the availability and modifiability of source code.3 In Europe the French-English construct libre software has been widely adopted to unambiguously capture the connotation intended by the FSF. |