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We maintain this free software
definition to show clearly what must be true about a
particular software program for it to be considered
free software.
``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. More precisely, it refers to four
kinds of freedom, for the users of the software:
- The freedom to run the program, for any
purpose (freedom 0).
- The freedom to study how the program works,
and adapt it to your needs (freedom 1). Access
to the source code is a precondition for this.
- The freedom to redistribute copies so you
can help your neighbour (freedom 2).
- The freedom to improve the program, and
release your improvements to the public, so that
the whole community benefits (freedom 3). Access
to the source code is a precondition for this.
A program is free software if users have all of
these freedoms. Thus, you should be free to
redistribute copies, either with or without
modifications, either gratis or charging a fee for
distribution, to
anyone anywhere. Being free to do these things
means (among other things) that you do not have to
ask or pay for permission.

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