### GNU GENERAL PUBLIC LICENSE

Version 2, June 1991

    Copyright (C) 1989, 1991 Free Software Foundation, Inc.  

    51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA

    Everyone is permitted to copy and distribute verbatim copies

    of this license document, but changing it is not allowed.

### Preamble

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 Lesser 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.

The precise terms and conditions for copying, distribution and

modification follow.

### 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

copyright notice and disclaimer of warranty; keep intact all the

notices that refer to this License and to the absence of any warranty;

and give any other recipients of the Program a copy of this License

along with the Program.

You may charge a fee for the physical act of transferring a copy, and

you may at your option offer warranty protection in exchange for a

fee.

**2.** You may modify your copy or copies of the Program or any

portion of it, thus forming a work based on the Program, and copy and

distribute such modifications or work under the terms of Section 1

above, provided that you also meet all of these conditions:

**a)** You must cause the modified files to carry prominent notices

stating that you changed the files and the date of any change.

**b)** You must cause any work that you distribute or publish, that in

whole or in part contains or is derived from the Program or any part

thereof, to be licensed as a whole at no charge to all third parties

under the terms of this License.

**c)** If the modified program normally reads commands interactively

when run, you must cause it, when started running for such interactive

use in the most ordinary way, to print or display an announcement

including an appropriate copyright notice and a notice that there is

no warranty (or else, saying that you provide a warranty) and that

users may redistribute the program under these conditions, and telling

the user how to view a copy of this License. (Exception: if the

Program itself is interactive but does not normally print such an

announcement, your work based on the Program is not required to print

an announcement.)

These requirements apply to the modified work as a whole. If

identifiable sections of that work are not derived from the Program,

and can be reasonably considered independent and separate works in

themselves, then this License, and its terms, do not apply to those

sections when you distribute them as separate works. But when you

distribute the same sections as part of a whole which is a work based

on the Program, the distribution of the whole must be on the terms of

this License, whose permissions for other licensees extend to the

entire whole, and thus to each and every part regardless of who wrote

it.

Thus, it is not the intent of this section to claim rights or contest

your rights to work written entirely by you; rather, the intent is to

exercise the right to control the distribution of derivative or

collective works based on the Program.

In addition, mere aggregation of another work not based on the Program

with the Program (or with a work based on the Program) on a volume of

a storage or distribution medium does not bring the other work under

the scope of this License.

**3.** You may copy and distribute the Program (or a work based on it,

under Section 2) in object code or executable form under the terms of

Sections 1 and 2 above provided that you also do one of the following:

**a)** Accompany it with the complete corresponding machine-readable

source code, which must be distributed under the terms of Sections 1

and 2 above on a medium customarily used for software interchange; or,

**b)** Accompany it with a written offer, valid for at least three

years, to give any third party, for a charge no more than your cost of

physically performing source distribution, a complete machine-readable

copy of the corresponding source code, to be distributed under the

terms of Sections 1 and 2 above on a medium customarily used for

software interchange; or,

**c)** Accompany it with the information you received as to the offer

to distribute corresponding source code. (This alternative is allowed

only for noncommercial distribution and only if you received the

program in object code or executable form with such an offer, in

accord with Subsection b above.)

The source code for a work means the preferred form of the work for

making modifications to it. For an executable work, complete source

code means all the source code for all modules it contains, plus any

associated interface definition files, plus the scripts used to

control compilation and installation of the executable. However, as a

special exception, the source code distributed need not include

anything that is normally distributed (in either source or binary

form) with the major components (compiler, kernel, and so on) of the

operating system on which the executable runs, unless that component

itself accompanies the executable.

If distribution of executable or object code is made by offering

access to copy from a designated place, then offering equivalent

access to copy the source code from the same place counts as

distribution of the source code, even though third parties are not

compelled to copy the source along with the object code.

**4.** You may not copy, modify, sublicense, or distribute the Program

except as expressly provided under this License. Any attempt otherwise

to copy, modify, sublicense or distribute the Program is void, and

will automatically terminate your rights under this License. However,

parties who have received copies, or rights, from you under this

License will not have their licenses terminated so long as such

parties remain in full compliance.

**5.** You are not required to accept this License, since you have not

signed it. However, nothing else grants you permission to modify or

distribute the Program or its derivative works. These actions are

prohibited by law if you do not accept this License. Therefore, by

modifying or distributing the Program (or any work based on the

Program), you indicate your acceptance of this License to do so, and

all its terms and conditions for copying, distributing or modifying

the Program or works based on it.

**6.** Each time you redistribute the Program (or any work based on

the Program), the recipient automatically receives a license from the

original licensor to copy, distribute or modify the Program subject to

these terms and conditions. You may not impose any further

restrictions on the recipients' exercise of the rights granted herein.

You are not responsible for enforcing compliance by third parties to

this License.

**7.** If, as a consequence of a court judgment or allegation of

patent infringement or for any other reason (not limited to patent

issues), conditions are imposed on you (whether by court order,

agreement or otherwise) that contradict the conditions of this

License, they do not excuse you from the conditions of this License.

If you cannot distribute so as to satisfy simultaneously your

obligations under this License and any other pertinent obligations,

then as a consequence you may not distribute the Program at all. For

example, if a patent license would not permit royalty-free

redistribution of the Program by all those who receive copies directly

or indirectly through you, then the only way you could satisfy both it

and this License would be to refrain entirely from distribution of the

Program.

If any portion of this section is held invalid or unenforceable under

any particular circumstance, the balance of the section is intended to

apply and the section as a whole is intended to apply in other

circumstances.

It is not the purpose of this section to induce you to infringe any

patents or other property right claims or to contest validity of any

such claims; this section has the sole purpose of protecting the

integrity of the free software distribution system, which is

implemented by public license practices. Many people have made

generous contributions to the wide range of software distributed

through that system in reliance on consistent application of that

system; it is up to the author/donor to decide if he or she is willing

to distribute software through any other system and a licensee cannot

impose that choice.

This section is intended to make thoroughly clear what is believed to

be a consequence of the rest of this License.

**8.** If the distribution and/or use of the Program is restricted in

certain countries either by patents or by copyrighted interfaces, the

original copyright holder who places the Program under this License

may add an explicit geographical distribution limitation excluding

those countries, so that distribution is permitted only in or among

countries not thus excluded. In such case, this License incorporates

the limitation as if written in the body of this License.

**9.** The Free Software Foundation may publish revised and/or new

versions of the General Public License from time to time. Such new

versions will be similar in spirit to the present version, but may

differ in detail to address new problems or concerns.

Each version is given a distinguishing version number. If the Program

specifies a version number of this License which applies to it and

"any later version", you have the option of following the terms and

conditions either of that version or of any later version published by

the Free Software Foundation. If the Program does not specify a

version number of this License, you may choose any version ever

published by the Free Software Foundation.

**10.** If you wish to incorporate parts of the Program into other

free programs whose distribution conditions are different, write to

the author to ask for permission. For software which is copyrighted by

the Free Software Foundation, write to the Free Software Foundation;

we sometimes make exceptions for this. Our decision will be guided by

the two goals of preserving the free status of all derivatives of our

free software and of promoting the sharing and reuse of software

generally.

**NO WARRANTY**

**11.** BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO

WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.

EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR

OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY

KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE

IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE

PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME

THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.

**12.** IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN

WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY

AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU

FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR

CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE

PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING

RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A

FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF

SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH

DAMAGES.

### END OF TERMS AND CONDITIONS

### How to Apply These Terms to Your New Programs

If you develop a new program, and you want it to be of the greatest

possible use to the public, the best way to achieve this is to make it

free software which everyone can redistribute and change under these

terms.

To do so, attach the following notices to the program. It is safest to

attach them to the start of each source file to most effectively

convey the exclusion of warranty; and each file should have at least

the "copyright" line and a pointer to where the full notice is found.

    one line to give the program's name and an idea of what it does.

    Copyright (C) yyyy  name of author

    This program is free software; you can redistribute it and/or

    modify it under the terms of the GNU General Public License

    as published by the Free Software Foundation; either version 2

    of the License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License

    along with this program; if not, write to the Free Software

    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

Also add information on how to contact you by electronic and paper

mail.

If the program is interactive, make it output a short notice like this

when it starts in an interactive mode:

    Gnomovision version 69, Copyright (C) year name of author

    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details

    type `show w'.  This is free software, and you are welcome

    to redistribute it under certain conditions; type `show c' 

    for details.

The hypothetical commands \`show w' and \`show c' should show the

appropriate parts of the General Public License. Of course, the

commands you use may be called something other than \`show w' and

\`show c'; they could even be mouse-clicks or menu items--whatever

suits your program.

You should also get your employer (if you work as a programmer) or

your school, if any, to sign a "copyright disclaimer" for the program,

if necessary. Here is a sample; alter the names:

    Yoyodyne, Inc., hereby disclaims all copyright

    interest in the program `Gnomovision'

    (which makes passes at compilers) written 

    by James Hacker.

    signature of Ty Coon, 1 April 1989

    Ty Coon, President of Vice

This General Public License does not permit incorporating your program

into proprietary programs. If your program is a subroutine library,

you may consider it more useful to permit linking proprietary

applications with the library. If this is what you want to do, use the

[GNU Lesser General Public

License](http://www.gnu.org/licenses/lgpl.html) instead of this

License.