1

                    GNU GENERAL PUBLIC LICENSE

     2

                       Version 2, June 1991

     3

     4

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

     5

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

     6

 Everyone is permitted to copy and distribute verbatim copies

     7

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

     8

     9

                            Preamble

    10

    11

  The licenses for most software are designed to take away your

    12

freedom to share and change it.  By contrast, the GNU General Public

    13

License is intended to guarantee your freedom to share and change free

    14

software--to make sure the software is free for all its users.  This

    15

General Public License applies to most of the Free Software

    16

Foundation's software and to any other program whose authors commit to

    17

using it.  (Some other Free Software Foundation software is covered by

    18

the GNU Lesser General Public License instead.)  You can apply it to

    19

your programs, too.

    20

    21

  When we speak of free software, we are referring to freedom, not

    22

price.  Our General Public Licenses are designed to make sure that you

    23

have the freedom to distribute copies of free software (and charge for

    24

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

    25

if you want it, that you can change the software or use pieces of it

    26

in new free programs; and that you know you can do these things.

    27

    28

  To protect your rights, we need to make restrictions that forbid

    29

anyone to deny you these rights or to ask you to surrender the rights.

    30

These restrictions translate to certain responsibilities for you if you

    31

distribute copies of the software, or if you modify it.

    32

    33

  For example, if you distribute copies of such a program, whether

    34

gratis or for a fee, you must give the recipients all the rights that

    35

you have.  You must make sure that they, too, receive or can get the

    36

source code.  And you must show them these terms so they know their

    37

rights.

    38

    39

  We protect your rights with two steps: (1) copyright the software, and

    40

(2) offer you this license which gives you legal permission to copy,

    41

distribute and/or modify the software.

    42

    43

  Also, for each author's protection and ours, we want to make certain

    44

that everyone understands that there is no warranty for this free

    45

software.  If the software is modified by someone else and passed on, we

    46

want its recipients to know that what they have is not the original, so

    47

that any problems introduced by others will not reflect on the original

    48

authors' reputations.

    49

    50

  Finally, any free program is threatened constantly by software

    51

patents.  We wish to avoid the danger that redistributors of a free

    52

program will individually obtain patent licenses, in effect making the

    53

program proprietary.  To prevent this, we have made it clear that any

    54

patent must be licensed for everyone's free use or not licensed at all.

    55

    56

  The precise terms and conditions for copying, distribution and

    57

modification follow.

    58

    59

                    GNU GENERAL PUBLIC LICENSE

    60

   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

    61

    62

  0. This License applies to any program or other work which contains

    63

a notice placed by the copyright holder saying it may be distributed

    64

under the terms of this General Public License.  The "Program", below,

    65

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

    66

means either the Program or any derivative work under copyright law:

    67

that is to say, a work containing the Program or a portion of it,

    68

either verbatim or with modifications and/or translated into another

    69

language.  (Hereinafter, translation is included without limitation in

    70

the term "modification".)  Each licensee is addressed as "you".

    71

    72

Activities other than copying, distribution and modification are not

    73

covered by this License; they are outside its scope.  The act of

    74

running the Program is not restricted, and the output from the Program

    75

is covered only if its contents constitute a work based on the

    76

Program (independent of having been made by running the Program).

    77

Whether that is true depends on what the Program does.

    78

    79

  1. You may copy and distribute verbatim copies of the Program's

    80

source code as you receive it, in any medium, provided that you

    81

conspicuously and appropriately publish on each copy an appropriate

    82

copyright notice and disclaimer of warranty; keep intact all the

    83

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

    84

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

    85

along with the Program.

    86

    87

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

    88

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

    89

    90

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

    91

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

    92

distribute such modifications or work under the terms of Section 1

    93

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

    94

    95

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

    96

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

    97

    98

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

    99

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

   100

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

   101

    parties under the terms of this License.

   102

   103

    c) If the modified program normally reads commands interactively

   104

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

   105

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

   106

    announcement including an appropriate copyright notice and a

   107

    notice that there is no warranty (or else, saying that you provide

   108

    a warranty) and that users may redistribute the program under

   109

    these conditions, and telling the user how to view a copy of this

   110

    License.  (Exception: if the Program itself is interactive but

   111

    does not normally print such an announcement, your work based on

   112

    the Program is not required to print an announcement.)

   113

   114

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

   115

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

   116

and can be reasonably considered independent and separate works in

   117

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

   118

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

   119

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

   120

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

   121

this License, whose permissions for other licensees extend to the

   122

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

   123

   124

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

   125

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

   126

exercise the right to control the distribution of derivative or

   127

collective works based on the Program.

   128

   129

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

   130

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

   131

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

   132

the scope of this License.

   133

   134

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

   135

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

   136

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

   137

   138

    a) Accompany it with the complete corresponding machine-readable

   139

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

   140

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

   141

   142

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

   143

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

   144

    cost of physically performing source distribution, a complete

   145

    machine-readable copy of the corresponding source code, to be

   146

    distributed under the terms of Sections 1 and 2 above on a medium

   147

    customarily used for software interchange; or,

   148

   149

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

   150

    to distribute corresponding source code.  (This alternative is

   151

    allowed only for noncommercial distribution and only if you

   152

    received the program in object code or executable form with such

   153

    an offer, in accord with Subsection b above.)

   154

   155

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

   156

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

   157

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

   158

associated interface definition files, plus the scripts used to

   159

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

   160

special exception, the source code distributed need not include

   161

anything that is normally distributed (in either source or binary

   162

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

   163

operating system on which the executable runs, unless that component

   164

itself accompanies the executable.

   165

   166

If distribution of executable or object code is made by offering

   167

access to copy from a designated place, then offering equivalent

   168

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

   169

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

   170

compelled to copy the source along with the object code.

   171

   172

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

   173

except as expressly provided under this License.  Any attempt

   174

otherwise to copy, modify, sublicense or distribute the Program is

   175

void, and will automatically terminate your rights under this License.

   176

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

   177

this License will not have their licenses terminated so long as such

   178

parties remain in full compliance.

   179

   180

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

   181

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

   182

distribute the Program or its derivative works.  These actions are

   183

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

   184

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

   185

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

   186

all its terms and conditions for copying, distributing or modifying

   187

the Program or works based on it.

   188

   189

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

   190

Program), the recipient automatically receives a license from the

   191

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

   192

these terms and conditions.  You may not impose any further

   193

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

   194

You are not responsible for enforcing compliance by third parties to

   195

this License.

   196

   197

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

   198

infringement or for any other reason (not limited to patent issues),

   199

conditions are imposed on you (whether by court order, agreement or

   200

otherwise) that contradict the conditions of this License, they do not

   201

excuse you from the conditions of this License.  If you cannot

   202

distribute so as to satisfy simultaneously your obligations under this

   203

License and any other pertinent obligations, then as a consequence you

   204

may not distribute the Program at all.  For example, if a patent

   205

license would not permit royalty-free redistribution of the Program by

   206

all those who receive copies directly or indirectly through you, then

   207

the only way you could satisfy both it and this License would be to

   208

refrain entirely from distribution of the Program.

   209

   210

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

   211

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

   212

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

   213

circumstances.

   214

   215

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

   216

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

   217

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

   218

integrity of the free software distribution system, which is

   219

implemented by public license practices.  Many people have made

   220

generous contributions to the wide range of software distributed

   221

through that system in reliance on consistent application of that

   222

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

   223

to distribute software through any other system and a licensee cannot

   224

impose that choice.

   225

   226

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

   227

be a consequence of the rest of this License.

   228

   229

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

   230

certain countries either by patents or by copyrighted interfaces, the

   231

original copyright holder who places the Program under this License

   232

may add an explicit geographical distribution limitation excluding

   233

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

   234

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

   235

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

   236

   237

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

   238

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

   239

be similar in spirit to the present version, but may differ in detail to

   240

address new problems or concerns.

   241

   242

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

   243

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

   244

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

   245

either of that version or of any later version published by the Free

   246

Software Foundation.  If the Program does not specify a version number of

   247

this License, you may choose any version ever published by the Free Software

   248

Foundation.

   249

   250

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

   251

programs whose distribution conditions are different, write to the author

   252

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

   253

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

   254

make exceptions for this.  Our decision will be guided by the two goals

   255

of preserving the free status of all derivatives of our free software and

   256

of promoting the sharing and reuse of software generally.

   257

   258

                            NO WARRANTY

   259

   260

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

   261

FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN

   262

OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES

   263

PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED

   264

OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

   265

MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS

   266

TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE

   267

PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,

   268

REPAIR OR CORRECTION.

   269

   270

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

   271

WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR

   272

REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,

   273

INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING

   274

OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED

   275

TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY

   276

YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER

   277

PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE

   278

POSSIBILITY OF SUCH DAMAGES.

   279

   280

                     END OF TERMS AND CONDITIONS

   281

   282

            How to Apply These Terms to Your New Programs

   283

   284

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

   285

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

   286

free software which everyone can redistribute and change under these terms.

   287

   288

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

   289

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

   290

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

   291

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

   292

   293

    <one line to give the program's name and a brief idea of what it does.>

   294

    Copyright (C) <year>  <name of author>

   295

   296

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

   297

    it under the terms of the GNU General Public License as published by

   298

    the Free Software Foundation; either version 2 of the License, or

   299

    (at your option) any later version.

   300

   301

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

   302

    but WITHOUT ANY WARRANTY; without even the implied warranty of

   303

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   304

    GNU General Public License for more details.

   305

   306

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

   307

    with this program; if not, write to the Free Software Foundation, Inc.,

   308

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

   309

   310

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

   311

   312

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

   313

when it starts in an interactive mode:

   314

   315

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

   316

    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.

   317

    This is free software, and you are welcome to redistribute it

   318

    under certain conditions; type `show c' for details.

   319

   320

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

   321

parts of the General Public License.  Of course, the commands you use may

   322

be called something other than `show w' and `show c'; they could even be

   323

mouse-clicks or menu items--whatever suits your program.

   324

   325

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

   326

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

   327

necessary.  Here is a sample; alter the names:

   328

   329

  Yoyodyne, Inc., hereby disclaims all copyright interest in the program

   330

  `Gnomovision' (which makes passes at compilers) written by James Hacker.

   331

   332

  <signature of Ty Coon>, 1 April 1989

   333

  Ty Coon, President of Vice

   334

   335

This General Public License does not permit incorporating your program into

   336

proprietary programs.  If your program is a subroutine library, you may

   337

consider it more useful to permit linking proprietary applications with the

   338

library.  If this is what you want to do, use the GNU Lesser General

   339

Public License instead of this License.