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Appendix
Open source software licences
GNU General Public Licence (GPL)
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Everyone is permitted to copy and distribute verbatim copies of this licence document, but
changing it is not allowed.
Preamble
The licences for most software are designed to take away your freedom to share and change it.
By contrast, the GNU General Public Licence is intended to guarantee your freedom to share and
change free software – to make sure the software is free for all its users. This General Public
Licence applies to most of the Free Software Foundation's software and to any other program
where the authors commit to using it. (Some other Free Software Foundation software is cov-
ered by the GNU Lesser General Public Licence instead.) You can apply it to your programs, too.
When we speak of free software, we are referring to freedom, not price. Our General Public
Licences are designed to make sure that you have the freedom to distribute copies of free soft-
ware (and charge for this service if you wish), that you receive source code or can get it if you
want it, that you can change the software or use pieces of it in new free programs, and that you
know you can do these things.
To protect your rights, we need to impose restrictions that forbid anyone to deny you these
rights or to ask you to surrender the rights. These restrictions translate into certain responsibil-
ities for you if you distribute copies of the software, or if you modify it.
For example, if you distribute copies of such a program, whether gratis or for a fee, you must
give the recipients all the rights that you have. You must make sure that they, too, receive or can
get the source code. And you must show them these terms so they know their rights.
We protect your rights with two steps: (1) copyright the software, and (2) offer you this licence
which gives you legal permission to copy, distribute and/or modify the software.
Also, for each author's protection and ours, we want to make certain that everyone understands
that there is no warranty for this free software. If the software is modified by someone else and
passed on, we want its recipients to know that what they have is not the original, so that any
problems introduced by others will not reflect on the original authors' reputations.
Finally, any free program is threatened constantly by software patents. We wish to avoid the
danger that redistributors of a free program will individually obtain patent licences, in effect
making the program proprietary. To prevent this, we have made it clear that any patent must be
licensed for everyone's free use or not licensed at all. The precise terms and conditions for cop-
ying, distribution and modification follow.
