User's Guide

Table Of Contents

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 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 make restrictions that forbid anyone to deny you these rights or to ask

you to surrender the rights. These restrictions translate to certain responsibilities 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 license 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 licenses, 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 copying, distribution and modification follow.

GNU GENERAL PUBLIC LICENSE TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND

MODIFICATION

0. This License applies to any program or other work which contains a notice placed by the copyright

holder saying it may be distributed under the terms of this General Public License. The "Program",

below, refers to any such program or work, and a "work based on the Program" means either the

Program or any derivative work under copyright law: that is to say, a work containing the Program or a

portion of it, either verbatim or with modifications and/or translated into another language. (Hereinafter,

translation is included without limitation in the term "modification".) Each licensee is addressed as "you".

Activities other than copying, distribution and modification are not covered by this License; they are

outside its scope. The act of running the Program is not restricted, and the output from the Program is

covered only if its contents constitute a work based on the Program (independent of having been made

by running the Program). Whether that is true depends on what the Program does.

1. You may copy and distribute verbatim copies of the Program's source code as you receive it, in any

medium, provided that you conspicuously and appropriately publish on each copy an appropriate

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