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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 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.