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The GNU General Public License

The GNU General

Public License

GNU General Public License

59 Temple Place, Suite 330, Boston, MA 02111-1307, USA

Cambridge, MA 02139, USA

Everyone is permitted to copy and distribute verbatim copies of this license

document, but changing it is not allowed.

Foreword

The licenses for most software are designed to take away your freedom to

share and change it. By contrast, the GNU General Public License 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 License applies

to most of the Free Software Foundation’s software and to any other program

whose authors commit to using it. (Some other Free Software Foundation

software is covered by the GNU Library General Public License 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 Licenses are designed to make sure that you have the

freedom to distribute copies of free software (and charge for this service if

you wish), that you receive source code or can get it if you want it, that you