It has a quarter century since the public presentation of the idea of the GNU by Richard Stallman.

To the GNU operating system consisting entirely of free software. His name is a recursive acronym development of the GNU's Not Unix. It was created because Stallman tried to create a system that users can analyze, share, edit and publish their modified versions. 27 September 1983 Stallman published his idea on Usenet net.unix-wizards and net.usoft. The work began on January 5, 1984, when departed from work at MIT. In March 1985 year, the GNU Manifesto. Stallman initially worked on the same applications, which have come into the composition of its system, but soon began to help his volunteers, which liked the idea of a free system.

Since today the official kernel, known as Hurd, is not complete, is widely used Linux kernel that Linus Torvalds developed and which is currently developed with the help of a large community. Therefore, we are talking about GNU / Linux. This combination has become the most popular alternative to closed, privately-owned systems such as Microsoft Windows.

As part of the GNU was not just the software, but also a license for him, the GNU General Public License (GPL), the GNU Lesser General Public License (LGPL) and the GNU Free Documentation License (GFDL).

On the occasion of the anniversary of the movie was Happy Birthday to the GNU, recalling the history of freedom. It is available in a free format OGV.

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