1

                    GNU GENERAL PUBLIC LICENSE

     2

                       Version 3, 29 June 2007

     3

     4

 Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>

     5

 Everyone is permitted to copy and distribute verbatim copies

     6

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

     7

     8

                            Preamble

     9

    10

  The GNU General Public License is a free, copyleft license for

    11

software and other kinds of works.

    12

    13

  The licenses for most software and other practical works are designed

    14

to take away your freedom to share and change the works.  By contrast,

    15

the GNU General Public License is intended to guarantee your freedom to

    16

share and change all versions of a program--to make sure it remains free

    17

software for all its users.  We, the Free Software Foundation, use the

    18

GNU General Public License for most of our software; it applies also to

    19

any other work released this way by its authors.  You can apply it to

    20

your programs, too.

    21

    22

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

    23

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

    24

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

    25

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

    26

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

    27

free programs, and that you know you can do these things.

    28

    29

  To protect your rights, we need to prevent others from denying you

    30

these rights or asking you to surrender the rights.  Therefore, you have

    31

certain responsibilities if you distribute copies of the software, or if

    32

you modify it: responsibilities to respect the freedom of others.

    33

    34

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

    35

gratis or for a fee, you must pass on to the recipients the same

    36

freedoms that you received.  You must make sure that they, too, receive

    37

or can get the source code.  And you must show them these terms so they

    38

know their rights.

    39

    40

  Developers that use the GNU GPL protect your rights with two steps:

    41

(1) assert copyright on the software, and (2) offer you this License

    42

giving you legal permission to copy, distribute and/or modify it.

    43

    44

  For the developers' and authors' protection, the GPL clearly explains

    45

that there is no warranty for this free software.  For both users' and

    46

authors' sake, the GPL requires that modified versions be marked as

    47

changed, so that their problems will not be attributed erroneously to

    48

authors of previous versions.

    49

    50

  Some devices are designed to deny users access to install or run

    51

modified versions of the software inside them, although the manufacturer

    52

can do so.  This is fundamentally incompatible with the aim of

    53

protecting users' freedom to change the software.  The systematic

    54

pattern of such abuse occurs in the area of products for individuals to

    55

use, which is precisely where it is most unacceptable.  Therefore, we

    56

have designed this version of the GPL to prohibit the practice for those

    57

products.  If such problems arise substantially in other domains, we

    58

stand ready to extend this provision to those domains in future versions

    59

of the GPL, as needed to protect the freedom of users.

    60

    61

  Finally, every program is threatened constantly by software patents.

    62

States should not allow patents to restrict development and use of

    63

software on general-purpose computers, but in those that do, we wish to

    64

avoid the special danger that patents applied to a free program could

    65

make it effectively proprietary.  To prevent this, the GPL assures that

    66

patents cannot be used to render the program non-free.

    67

    68

  The precise terms and conditions for copying, distribution and

    69

modification follow.

    70

    71

                       TERMS AND CONDITIONS

    72

    73

  0. Definitions.

    74

    75

  "This License" refers to version 3 of the GNU General Public License.

    76

    77

  "Copyright" also means copyright-like laws that apply to other kinds of

    78

works, such as semiconductor masks.

    79

    80

  "The Program" refers to any copyrightable work licensed under this

    81

License.  Each licensee is addressed as "you".  "Licensees" and

    82

"recipients" may be individuals or organizations.

    83

    84

  To "modify" a work means to copy from or adapt all or part of the work

    85

in a fashion requiring copyright permission, other than the making of an

    86

exact copy.  The resulting work is called a "modified version" of the

    87

earlier work or a work "based on" the earlier work.

    88

    89

  A "covered work" means either the unmodified Program or a work based

    90

on the Program.

    91

    92

  To "propagate" a work means to do anything with it that, without

    93

permission, would make you directly or secondarily liable for

    94

infringement under applicable copyright law, except executing it on a

    95

computer or modifying a private copy.  Propagation includes copying,

    96

distribution (with or without modification), making available to the

    97

public, and in some countries other activities as well.

    98

    99

  To "convey" a work means any kind of propagation that enables other

   100

parties to make or receive copies.  Mere interaction with a user through

   101

a computer network, with no transfer of a copy, is not conveying.

   102

   103

  An interactive user interface displays "Appropriate Legal Notices"

   104

to the extent that it includes a convenient and prominently visible

   105

feature that (1) displays an appropriate copyright notice, and (2)

   106

tells the user that there is no warranty for the work (except to the

   107

extent that warranties are provided), that licensees may convey the

   108

work under this License, and how to view a copy of this License.  If

   109

the interface presents a list of user commands or options, such as a

   110

menu, a prominent item in the list meets this criterion.

   111

   112

  1. Source Code.

   113

   114

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

   115

for making modifications to it.  "Object code" means any non-source

   116

form of a work.

   117

   118

  A "Standard Interface" means an interface that either is an official

   119

standard defined by a recognized standards body, or, in the case of

   120

interfaces specified for a particular programming language, one that

   121

is widely used among developers working in that language.

   122

   123

  The "System Libraries" of an executable work include anything, other

   124

than the work as a whole, that (a) is included in the normal form of

   125

packaging a Major Component, but which is not part of that Major

   126

Component, and (b) serves only to enable use of the work with that

   127

Major Component, or to implement a Standard Interface for which an

   128

implementation is available to the public in source code form.  A

   129

"Major Component", in this context, means a major essential component

   130

(kernel, window system, and so on) of the specific operating system

   131

(if any) on which the executable work runs, or a compiler used to

   132

produce the work, or an object code interpreter used to run it.

   133

   134

  The "Corresponding Source" for a work in object code form means all

   135

the source code needed to generate, install, and (for an executable

   136

work) run the object code and to modify the work, including scripts to

   137

control those activities.  However, it does not include the work's

   138

System Libraries, or general-purpose tools or generally available free

   139

programs which are used unmodified in performing those activities but

   140

which are not part of the work.  For example, Corresponding Source

   141

includes interface definition files associated with source files for

   142

the work, and the source code for shared libraries and dynamically

   143

linked subprograms that the work is specifically designed to require,

   144

such as by intimate data communication or control flow between those

   145

subprograms and other parts of the work.

   146

   147

  The Corresponding Source need not include anything that users

   148

can regenerate automatically from other parts of the Corresponding

   149

Source.

   150

   151

  The Corresponding Source for a work in source code form is that

   152

same work.

   153

   154

  2. Basic Permissions.

   155

   156

  All rights granted under this License are granted for the term of

   157

copyright on the Program, and are irrevocable provided the stated

   158

conditions are met.  This License explicitly affirms your unlimited

   159

permission to run the unmodified Program.  The output from running a

   160

covered work is covered by this License only if the output, given its

   161

content, constitutes a covered work.  This License acknowledges your

   162

rights of fair use or other equivalent, as provided by copyright law.

   163

   164

  You may make, run and propagate covered works that you do not

   165

convey, without conditions so long as your license otherwise remains

   166

in force.  You may convey covered works to others for the sole purpose

   167

of having them make modifications exclusively for you, or provide you

   168

with facilities for running those works, provided that you comply with

   169

the terms of this License in conveying all material for which you do

   170

not control copyright.  Those thus making or running the covered works

   171

for you must do so exclusively on your behalf, under your direction

   172

and control, on terms that prohibit them from making any copies of

   173

your copyrighted material outside their relationship with you.

   174

   175

  Conveying under any other circumstances is permitted solely under

   176

the conditions stated below.  Sublicensing is not allowed; section 10

   177

makes it unnecessary.

   178

   179

  3. Protecting Users' Legal Rights From Anti-Circumvention Law.

   180

   181

  No covered work shall be deemed part of an effective technological

   182

measure under any applicable law fulfilling obligations under article

   183

11 of the WIPO copyright treaty adopted on 20 December 1996, or

   184

similar laws prohibiting or restricting circumvention of such

   185

measures.

   186

   187

  When you convey a covered work, you waive any legal power to forbid

   188

circumvention of technological measures to the extent such circumvention

   189

is effected by exercising rights under this License with respect to

   190

the covered work, and you disclaim any intention to limit operation or

   191

modification of the work as a means of enforcing, against the work's

   192

users, your or third parties' legal rights to forbid circumvention of

   193

technological measures.

   194

   195

  4. Conveying Verbatim Copies.

   196

   197

  You may convey verbatim copies of the Program's source code as you

   198

receive it, in any medium, provided that you conspicuously and

   199

appropriately publish on each copy an appropriate copyright notice;

   200

keep intact all notices stating that this License and any

   201

non-permissive terms added in accord with section 7 apply to the code;

   202

keep intact all notices of the absence of any warranty; and give all

   203

recipients a copy of this License along with the Program.

   204

   205

  You may charge any price or no price for each copy that you convey,

   206

and you may offer support or warranty protection for a fee.

   207

   208

  5. Conveying Modified Source Versions.

   209

   210

  You may convey a work based on the Program, or the modifications to

   211

produce it from the Program, in the form of source code under the

   212

terms of section 4, provided that you also meet all of these conditions:

   213

   214

    a) The work must carry prominent notices stating that you modified

   215

    it, and giving a relevant date.

   216

   217

    b) The work must carry prominent notices stating that it is

   218

    released under this License and any conditions added under section

   219

    7.  This requirement modifies the requirement in section 4 to

   220

    "keep intact all notices".

   221

   222

    c) You must license the entire work, as a whole, under this

   223

    License to anyone who comes into possession of a copy.  This

   224

    License will therefore apply, along with any applicable section 7

   225

    additional terms, to the whole of the work, and all its parts,

   226

    regardless of how they are packaged.  This License gives no

   227

    permission to license the work in any other way, but it does not

   228

    invalidate such permission if you have separately received it.

   229

   230

    d) If the work has interactive user interfaces, each must display

   231

    Appropriate Legal Notices; however, if the Program has interactive

   232

    interfaces that do not display Appropriate Legal Notices, your

   233

    work need not make them do so.

   234

   235

  A compilation of a covered work with other separate and independent

   236

works, which are not by their nature extensions of the covered work,

   237

and which are not combined with it such as to form a larger program,

   238

in or on a volume of a storage or distribution medium, is called an

   239

"aggregate" if the compilation and its resulting copyright are not

   240

used to limit the access or legal rights of the compilation's users

   241

beyond what the individual works permit.  Inclusion of a covered work

   242

in an aggregate does not cause this License to apply to the other

   243

parts of the aggregate.

   244

   245

  6. Conveying Non-Source Forms.

   246

   247

  You may convey a covered work in object code form under the terms

   248

of sections 4 and 5, provided that you also convey the

   249

machine-readable Corresponding Source under the terms of this License,

   250

in one of these ways:

   251

   252

    a) Convey the object code in, or embodied in, a physical product

   253

    (including a physical distribution medium), accompanied by the

   254

    Corresponding Source fixed on a durable physical medium

   255

    customarily used for software interchange.

   256

   257

    b) Convey the object code in, or embodied in, a physical product

   258

    (including a physical distribution medium), accompanied by a

   259

    written offer, valid for at least three years and valid for as

   260

    long as you offer spare parts or customer support for that product

   261

    model, to give anyone who possesses the object code either (1) a

   262

    copy of the Corresponding Source for all the software in the

   263

    product that is covered by this License, on a durable physical

   264

    medium customarily used for software interchange, for a price no

   265

    more than your reasonable cost of physically performing this

   266

    conveying of source, or (2) access to copy the

   267

    Corresponding Source from a network server at no charge.

   268

   269

    c) Convey individual copies of the object code with a copy of the

   270

    written offer to provide the Corresponding Source.  This

   271

    alternative is allowed only occasionally and noncommercially, and

   272

    only if you received the object code with such an offer, in accord

   273

    with subsection 6b.

   274

   275

    d) Convey the object code by offering access from a designated

   276

    place (gratis or for a charge), and offer equivalent access to the

   277

    Corresponding Source in the same way through the same place at no

   278

    further charge.  You need not require recipients to copy the

   279

    Corresponding Source along with the object code.  If the place to

   280

    copy the object code is a network server, the Corresponding Source

   281

    may be on a different server (operated by you or a third party)

   282

    that supports equivalent copying facilities, provided you maintain

   283

    clear directions next to the object code saying where to find the

   284

    Corresponding Source.  Regardless of what server hosts the

   285

    Corresponding Source, you remain obligated to ensure that it is

   286

    available for as long as needed to satisfy these requirements.

   287

   288

    e) Convey the object code using peer-to-peer transmission, provided

   289

    you inform other peers where the object code and Corresponding

   290

    Source of the work are being offered to the general public at no

   291

    charge under subsection 6d.

   292

   293

  A separable portion of the object code, whose source code is excluded

   294

from the Corresponding Source as a System Library, need not be

   295

included in conveying the object code work.

   296

   297

  A "User Product" is either (1) a "consumer product", which means any

   298

tangible personal property which is normally used for personal, family,

   299

or household purposes, or (2) anything designed or sold for incorporation

   300

into a dwelling.  In determining whether a product is a consumer product,

   301

doubtful cases shall be resolved in favor of coverage.  For a particular

   302

product received by a particular user, "normally used" refers to a

   303

typical or common use of that class of product, regardless of the status

   304

of the particular user or of the way in which the particular user

   305

actually uses, or expects or is expected to use, the product.  A product

   306

is a consumer product regardless of whether the product has substantial

   307

commercial, industrial or non-consumer uses, unless such uses represent

   308

the only significant mode of use of the product.

   309

   310

  "Installation Information" for a User Product means any methods,

   311

procedures, authorization keys, or other information required to install

   312

and execute modified versions of a covered work in that User Product from

   313

a modified version of its Corresponding Source.  The information must

   314

suffice to ensure that the continued functioning of the modified object

   315

code is in no case prevented or interfered with solely because

   316

modification has been made.

   317

   318

  If you convey an object code work under this section in, or with, or

   319

specifically for use in, a User Product, and the conveying occurs as

   320

part of a transaction in which the right of possession and use of the

   321

User Product is transferred to the recipient in perpetuity or for a

   322

fixed term (regardless of how the transaction is characterized), the

   323

Corresponding Source conveyed under this section must be accompanied

   324

by the Installation Information.  But this requirement does not apply

   325

if neither you nor any third party retains the ability to install

   326

modified object code on the User Product (for example, the work has

   327

been installed in ROM).

   328

   329

  The requirement to provide Installation Information does not include a

   330

requirement to continue to provide support service, warranty, or updates

   331

for a work that has been modified or installed by the recipient, or for

   332

the User Product in which it has been modified or installed.  Access to a

   333

network may be denied when the modification itself materially and

   334

adversely affects the operation of the network or violates the rules and

   335

protocols for communication across the network.

   336

   337

  Corresponding Source conveyed, and Installation Information provided,

   338

in accord with this section must be in a format that is publicly

   339

documented (and with an implementation available to the public in

   340

source code form), and must require no special password or key for

   341

unpacking, reading or copying.

   342

   343

  7. Additional Terms.

   344

   345

  "Additional permissions" are terms that supplement the terms of this

   346

License by making exceptions from one or more of its conditions.

   347

Additional permissions that are applicable to the entire Program shall

   348

be treated as though they were included in this License, to the extent

   349

that they are valid under applicable law.  If additional permissions

   350

apply only to part of the Program, that part may be used separately

   351

under those permissions, but the entire Program remains governed by

   352

this License without regard to the additional permissions.

   353

   354

  When you convey a copy of a covered work, you may at your option

   355

remove any additional permissions from that copy, or from any part of

   356

it.  (Additional permissions may be written to require their own

   357

removal in certain cases when you modify the work.)  You may place

   358

additional permissions on material, added by you to a covered work,

   359

for which you have or can give appropriate copyright permission.

   360

   361

  Notwithstanding any other provision of this License, for material you

   362

add to a covered work, you may (if authorized by the copyright holders of

   363

that material) supplement the terms of this License with terms:

   364

   365

    a) Disclaiming warranty or limiting liability differently from the

   366

    terms of sections 15 and 16 of this License; or

   367

   368

    b) Requiring preservation of specified reasonable legal notices or

   369

    author attributions in that material or in the Appropriate Legal

   370

    Notices displayed by works containing it; or

   371

   372

    c) Prohibiting misrepresentation of the origin of that material, or

   373

    requiring that modified versions of such material be marked in

   374

    reasonable ways as different from the original version; or

   375

   376

    d) Limiting the use for publicity purposes of names of licensors or

   377

    authors of the material; or

   378

   379

    e) Declining to grant rights under trademark law for use of some

   380

    trade names, trademarks, or service marks; or

   381

   382

    f) Requiring indemnification of licensors and authors of that

   383

    material by anyone who conveys the material (or modified versions of

   384

    it) with contractual assumptions of liability to the recipient, for

   385

    any liability that these contractual assumptions directly impose on

   386

    those licensors and authors.

   387

   388

  All other non-permissive additional terms are considered "further

   389

restrictions" within the meaning of section 10.  If the Program as you

   390

received it, or any part of it, contains a notice stating that it is

   391

governed by this License along with a term that is a further

   392

restriction, you may remove that term.  If a license document contains

   393

a further restriction but permits relicensing or conveying under this

   394

License, you may add to a covered work material governed by the terms

   395

of that license document, provided that the further restriction does

   396

not survive such relicensing or conveying.

   397

   398

  If you add terms to a covered work in accord with this section, you

   399

must place, in the relevant source files, a statement of the

   400

additional terms that apply to those files, or a notice indicating

   401

where to find the applicable terms.

   402

   403

  Additional terms, permissive or non-permissive, may be stated in the

   404

form of a separately written license, or stated as exceptions;

   405

the above requirements apply either way.

   406

   407

  8. Termination.

   408

   409

  You may not propagate or modify a covered work except as expressly

   410

provided under this License.  Any attempt otherwise to propagate or

   411

modify it is void, and will automatically terminate your rights under

   412

this License (including any patent licenses granted under the third

   413

paragraph of section 11).

   414

   415

  However, if you cease all violation of this License, then your

   416

license from a particular copyright holder is reinstated (a)

   417

provisionally, unless and until the copyright holder explicitly and

   418

finally terminates your license, and (b) permanently, if the copyright

   419

holder fails to notify you of the violation by some reasonable means

   420

prior to 60 days after the cessation.

   421

   422

  Moreover, your license from a particular copyright holder is

   423

reinstated permanently if the copyright holder notifies you of the

   424

violation by some reasonable means, this is the first time you have

   425

received notice of violation of this License (for any work) from that

   426

copyright holder, and you cure the violation prior to 30 days after

   427

your receipt of the notice.

   428

   429

  Termination of your rights under this section does not terminate the

   430

licenses of parties who have received copies or rights from you under

   431

this License.  If your rights have been terminated and not permanently

   432

reinstated, you do not qualify to receive new licenses for the same

   433

material under section 10.

   434

   435

  9. Acceptance Not Required for Having Copies.

   436

   437

  You are not required to accept this License in order to receive or

   438

run a copy of the Program.  Ancillary propagation of a covered work

   439

occurring solely as a consequence of using peer-to-peer transmission

   440

to receive a copy likewise does not require acceptance.  However,

   441

nothing other than this License grants you permission to propagate or

   442

modify any covered work.  These actions infringe copyright if you do

   443

not accept this License.  Therefore, by modifying or propagating a

   444

covered work, you indicate your acceptance of this License to do so.

   445

   446

  10. Automatic Licensing of Downstream Recipients.

   447

   448

  Each time you convey a covered work, the recipient automatically

   449

receives a license from the original licensors, to run, modify and

   450

propagate that work, subject to this License.  You are not responsible

   451

for enforcing compliance by third parties with this License.

   452

   453

  An "entity transaction" is a transaction transferring control of an

   454

organization, or substantially all assets of one, or subdividing an

   455

organization, or merging organizations.  If propagation of a covered

   456

work results from an entity transaction, each party to that

   457

transaction who receives a copy of the work also receives whatever

   458

licenses to the work the party's predecessor in interest had or could

   459

give under the previous paragraph, plus a right to possession of the

   460

Corresponding Source of the work from the predecessor in interest, if

   461

the predecessor has it or can get it with reasonable efforts.

   462

   463

  You may not impose any further restrictions on the exercise of the

   464

rights granted or affirmed under this License.  For example, you may

   465

not impose a license fee, royalty, or other charge for exercise of

   466

rights granted under this License, and you may not initiate litigation

   467

(including a cross-claim or counterclaim in a lawsuit) alleging that

   468

any patent claim is infringed by making, using, selling, offering for

   469

sale, or importing the Program or any portion of it.

   470

   471

  11. Patents.

   472

   473

  A "contributor" is a copyright holder who authorizes use under this

   474

License of the Program or a work on which the Program is based.  The

   475

work thus licensed is called the contributor's "contributor version".

   476

   477

  A contributor's "essential patent claims" are all patent claims

   478

owned or controlled by the contributor, whether already acquired or

   479

hereafter acquired, that would be infringed by some manner, permitted

   480

by this License, of making, using, or selling its contributor version,

   481

but do not include claims that would be infringed only as a

   482

consequence of further modification of the contributor version.  For

   483

purposes of this definition, "control" includes the right to grant

   484

patent sublicenses in a manner consistent with the requirements of

   485

this License.

   486

   487

  Each contributor grants you a non-exclusive, worldwide, royalty-free

   488

patent license under the contributor's essential patent claims, to

   489

make, use, sell, offer for sale, import and otherwise run, modify and

   490

propagate the contents of its contributor version.

   491

   492

  In the following three paragraphs, a "patent license" is any express

   493

agreement or commitment, however denominated, not to enforce a patent

   494

(such as an express permission to practice a patent or covenant not to

   495

sue for patent infringement).  To "grant" such a patent license to a

   496

party means to make such an agreement or commitment not to enforce a

   497

patent against the party.

   498

   499

  If you convey a covered work, knowingly relying on a patent license,

   500

and the Corresponding Source of the work is not available for anyone

   501

to copy, free of charge and under the terms of this License, through a

   502

publicly available network server or other readily accessible means,

   503

then you must either (1) cause the Corresponding Source to be so

   504

available, or (2) arrange to deprive yourself of the benefit of the

   505

patent license for this particular work, or (3) arrange, in a manner

   506

consistent with the requirements of this License, to extend the patent

   507

license to downstream recipients.  "Knowingly relying" means you have

   508

actual knowledge that, but for the patent license, your conveying the

   509

covered work in a country, or your recipient's use of the covered work

   510

in a country, would infringe one or more identifiable patents in that

   511

country that you have reason to believe are valid.

   512

   513

  If, pursuant to or in connection with a single transaction or

   514

arrangement, you convey, or propagate by procuring conveyance of, a

   515

covered work, and grant a patent license to some of the parties

   516

receiving the covered work authorizing them to use, propagate, modify

   517

or convey a specific copy of the covered work, then the patent license

   518

you grant is automatically extended to all recipients of the covered

   519

work and works based on it.

   520

   521

  A patent license is "discriminatory" if it does not include within

   522

the scope of its coverage, prohibits the exercise of, or is

   523

conditioned on the non-exercise of one or more of the rights that are

   524

specifically granted under this License.  You may not convey a covered

   525

work if you are a party to an arrangement with a third party that is

   526

in the business of distributing software, under which you make payment

   527

to the third party based on the extent of your activity of conveying

   528

the work, and under which the third party grants, to any of the

   529

parties who would receive the covered work from you, a discriminatory

   530

patent license (a) in connection with copies of the covered work