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Thanks to your support, 2015 marks 30 years of the FSF! In the next 30 years, we want to do even more to defend computer user rights. To kick off in that direction, we're setting our highest-ever fundraising goal of $525,000 by January 31st. Read more.

$525K
28% (145K)
Count me in

How Free Software and Open Source Relate as Categories of Programs

Here's how free software and open source relate as categories of programs:


       /----------------------------------------------\
      / |                                            | \
     /  |                                            |  \
        |                                            |   \
        |                                            |
        |                                            |
        |                                            |
free    |                                            |
        |                                            |
        |                                            |    open source
        |                                            |
        |                                            |
     \  |                                            |
      \ |                                            |
       \----------------------------------------------
        |                                        |   |   /
        |     tivoized (tyrant) devices          | O |  /
        |                                        |   | /
        ----------------------------------------------/

Tivoized or “tyrant” devices contain nonfree executables made from source code that is free. As of 2013, many Android devices are tyrant, but some are not.

“O” stands for “other” and refers to programs whose source is under licenses which are open source but not free.

 [FSF logo] “Our mission is to preserve, protect and promote the freedom to use, study, copy, modify, and redistribute computer software, and to defend the rights of Free Software users.”

The Free Software Foundation is the principal organizational sponsor of the GNU Operating System. Support GNU and the FSF by buying manuals and gear, joining the FSF as an associate member, or making a donation, either directly to the FSF or via Flattr.

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