22                             Preamble

    23 

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

    25 software and other kinds of works.

    26 

    27   The licenses for most software and other practical works are designed

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

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

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

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

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

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

    34 your programs, too.

    35 

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

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

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

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

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

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

    42 

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

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

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

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

    47 

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

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

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

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

    52 know their rights.

    53 

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

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

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

    57 

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

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

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

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

    62 authors of previous versions.

    63 

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

    65 modified versions of the software inside them, although the manufacturer

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

    67 protecting users' freedom to change the software.  The systematic

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

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

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

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

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

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

    74 

    75   Finally, every program is threatened constantly by software patents.

    76 States should not allow patents to restrict development and use of

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

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

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

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

    81 

    82   The precise terms and conditions for copying, distribution and

    83 modification follow.

    84 

    85                        TERMS AND CONDITIONS

    86 

    87   0. Definitions.

    88 

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

    90 

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

    92 works, such as semiconductor masks.

    93 

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

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

    96 "recipients" may be individuals or organizations.

    97 

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

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

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

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

   102 

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

   104 on the Program.

   105 

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

   107 permission, would make you directly or secondarily liable for

   108 infringement under applicable copyright law, except executing it on a

   109 computer or modifying a private copy.  Propagation includes copying,

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

   111 public, and in some countries other activities as well.

   112 

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

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

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

   116 

   117   An interactive user interface displays "Appropriate Legal Notices"

   118 to the extent that it includes a convenient and prominently visible

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

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

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

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

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

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

   125 

   126   1. Source Code.

   127 

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

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

   130 form of a work.

   131 

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

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

   134 interfaces specified for a particular programming language, one that

   135 is widely used among developers working in that language.

   136 

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

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

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

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

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

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

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

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

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

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

   147 

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

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

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

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

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

   153 programs which are used unmodified in performing those activities but

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

   155 includes interface definition files associated with source files for

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

   157 linked subprograms that the work is specifically designed to require,

   158 such as by intimate data communication or control flow between those

   159 subprograms and other parts of the work.

   160 

   161   The Corresponding Source need not include anything that users

   162 can regenerate automatically from other parts of the Corresponding

   163 Source.

   164 

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

   166 same work.

   167 

   168   2. Basic Permissions.

   169 

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

   171 copyright on the Program, and are irrevocable provided the stated

   172 conditions are met.  This License explicitly affirms your unlimited

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

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

   175 content, constitutes a covered work.  This License acknowledges your

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

   177 

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

   179 convey, without conditions so long as your license otherwise remains

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

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

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

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

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

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

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

   187 your copyrighted material outside their relationship with you.

   188 

   189   Conveying under any other circumstances is permitted solely under

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

   191 makes it unnecessary.

   192 

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

   194 

   195   No covered work shall be deemed part of an effective technological

   196 measure under any applicable law fulfilling obligations under article

   197 11 of the WIPO copyright treaty adopted on 20 December 1996, or

   198 similar laws prohibiting or restricting circumvention of such

   199 measures.

   200 

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

   202 circumvention of technological measures to the extent such circumvention

   203 is effected by exercising rights under this License with respect to

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

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

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

   207 technological measures.

   208 

   209   4. Conveying Verbatim Copies.

   210 

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

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

   213 appropriately publish on each copy an appropriate copyright notice;

   214 keep intact all notices stating that this License and any

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

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

   217 recipients a copy of this License along with the Program.

   218 

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

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

   221 

   222   5. Conveying Modified Source Versions.

   223 

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

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

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

   227 

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

   229     it, and giving a relevant date.

   230 

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

   232     released under this License and any conditions added under section

   233     7.  This requirement modifies the requirement in section 4 to

   234     "keep intact all notices".

   235 

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

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

   238     License will therefore apply, along with any applicable section 7

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

   240     regardless of how they are packaged.  This License gives no

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

   242     invalidate such permission if you have separately received it.

   243 

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

   245     Appropriate Legal Notices; however, if the Program has interactive

   246     interfaces that do not display Appropriate Legal Notices, your

   247     work need not make them do so.

   248 

   249   A compilation of a covered work with other separate and independent

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

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

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

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

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

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

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

   257 parts of the aggregate.

   258 

   259   6. Conveying Non-Source Forms.

   260 

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

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

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

   264 in one of these ways:

   265 

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

   267     (including a physical distribution medium), accompanied by the

   268     Corresponding Source fixed on a durable physical medium

   269     customarily used for software interchange.

   270 

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

   272     (including a physical distribution medium), accompanied by a

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

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

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

   276     copy of the Corresponding Source for all the software in the

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

   278     medium customarily used for software interchange, for a price no

   279     more than your reasonable cost of physically performing this

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

   281     Corresponding Source from a network server at no charge.

   282 

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

   284     written offer to provide the Corresponding Source.  This

   285     alternative is allowed only occasionally and noncommercially, and

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

   287     with subsection 6b.

   288 

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

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

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

   292     further charge.  You need not require recipients to copy the

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

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

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

   296     that supports equivalent copying facilities, provided you maintain

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

   298     Corresponding Source.  Regardless of what server hosts the

   299     Corresponding Source, you remain obligated to ensure that it is

   300     available for as long as needed to satisfy these requirements.

   301 

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

   303     you inform other peers where the object code and Corresponding

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

   305     charge under subsection 6d.

   306 

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

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

   309 included in conveying the object code work.

   310 

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

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

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

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

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

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

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

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

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

   320 is a consumer product regardless of whether the product has substantial

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

   322 the only significant mode of use of the product.

   323 

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

   325 procedures, authorization keys, or other information required to install

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

   327 a modified version of its Corresponding Source.  The information must

   328 suffice to ensure that the continued functioning of the modified object

   329 code is in no case prevented or interfered with solely because

   330 modification has been made.

   331 

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

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

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

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

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

   337 Corresponding Source conveyed under this section must be accompanied

   338 by the Installation Information.  But this requirement does not apply

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

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

   341 been installed in ROM).

   342 

   343   The requirement to provide Installation Information does not include a

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

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

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

   347 network may be denied when the modification itself materially and

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

   349 protocols for communication across the network.

   350 

   351   Corresponding Source conveyed, and Installation Information provided,

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

   353 documented (and with an implementation available to the public in

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

   355 unpacking, reading or copying.

   356 

   357   7. Additional Terms.

   358 

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

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

   361 Additional permissions that are applicable to the entire Program shall

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

   363 that they are valid under applicable law.  If additional permissions

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

   365 under those permissions, but the entire Program remains governed by

   366 this License without regard to the additional permissions.

   367 

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

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

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

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

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

   373 for which you have or can give appropriate copyright permission.

   374 

   375   Notwithstanding any other provision of this License, for material you

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

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

   378 

   379     a) Disclaiming warranty or limiting liability differently from the

   380     terms of sections 15 and 16 of this License; or

   381 

   382     b) Requiring preservation of specified reasonable legal notices or

   383     author attributions in that material or in the Appropriate Legal

   384     Notices displayed by works containing it; or

   385 

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

   387     requiring that modified versions of such material be marked in

   388     reasonable ways as different from the original version; or

   389 

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

   391     authors of the material; or

   392 

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

   394     trade names, trademarks, or service marks; or

   395 

   396     f) Requiring indemnification of licensors and authors of that

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

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

   399     any liability that these contractual assumptions directly impose on

   400     those licensors and authors.

   401 

   402   All other non-permissive additional terms are considered "further

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

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

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

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

   407 a further restriction but permits relicensing or conveying under this

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

   409 of that license document, provided that the further restriction does

   410 not survive such relicensing or conveying.

   411 

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

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

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

   415 where to find the applicable terms.

   416 

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

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

   419 the above requirements apply either way.

   420 

   421   8. Termination.

   422 

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

   424 provided under this License.  Any attempt otherwise to propagate or

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

   426 this License (including any patent licenses granted under the third

   427 paragraph of section 11).

   428 

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

   430 license from a particular copyright holder is reinstated (a)

   431 provisionally, unless and until the copyright holder explicitly and

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

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

   434 prior to 60 days after the cessation.

   435 

   436   Moreover, your license from a particular copyright holder is

   437 reinstated permanently if the copyright holder notifies you of the

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

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

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

   441 your receipt of the notice.

   442 

   443   Termination of your rights under this section does not terminate the

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

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

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

   447 material under section 10.

   448 

   449   9. Acceptance Not Required for Having Copies.

   450 

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

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

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

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

   455 nothing other than this License grants you permission to propagate or

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

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

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

   459 

   460   10. Automatic Licensing of Downstream Recipients.

   461 

   462   Each time you convey a covered work, the recipient automatically

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

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

   465 for enforcing compliance by third parties with this License.

   466 

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

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

   469 organization, or merging organizations.  If propagation of a covered

   470 work results from an entity transaction, each party to that

   471 transaction who receives a copy of the work also receives whatever

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

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

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

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

   476 

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

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

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

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

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

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

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

   484 

   485   11. Patents.

   486 

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

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

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

   490 

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

   492 owned or controlled by the contributor, whether already acquired or

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

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

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

   496 consequence of further modification of the contributor version.  For

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

   498 patent sublicenses in a manner consistent with the requirements of

   499 this License.

   500 

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

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

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

   504 propagate the contents of its contributor version.

   505 

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

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

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

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

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

   511 patent against the party.

   512 

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

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

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

   516 publicly available network server or other readily accessible means,

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

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

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

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

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

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

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

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

   525 country that you have reason to believe are valid.

   526 

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

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

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

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

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

   532 you grant is automatically extended to all recipients of the covered

   533 work and works based on it.

   534 

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

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

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

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

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

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

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

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

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

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

   545 conveyed by you (or copies made from those copies), or (b) primarily

   546 for and in connection with specific products or compilations that

   547 contain the covered work, unless you entered into that arrangement,

   548 or that patent license was granted, prior to 28 March 2007.

   549 

   550   Nothing in this License shall be construed as excluding or limiting

   551 any implied license or other defenses to infringement that may

   552 otherwise be available to you under applicable patent law.

   553 

   554   12. No Surrender of Others' Freedom.

   555 

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

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

   558 excuse you from the conditions of this License.  If you cannot convey a

   559 covered work so as to satisfy simultaneously your obligations under this

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

   561 not convey it at all.  For example, if you agree to terms that obligate you

   562 to collect a royalty for further conveying from those to whom you convey

   563 the Program, the only way you could satisfy both those terms and this

   564 License would be to refrain entirely from conveying the Program.

   565 

   566   13. Use with the GNU Affero General Public License.

   567 

   568   Notwithstanding any other provision of this License, you have

   569 permission to link or combine any covered work with a work licensed

   570 under version 3 of the GNU Affero General Public License into a single

   571 combined work, and to convey the resulting work.  The terms of this

   572 License will continue to apply to the part which is the covered work,

   573 but the special requirements of the GNU Affero General Public License,

   574 section 13, concerning interaction through a network will apply to the

   575 combination as such.

   576 

   577   14. Revised Versions of this License.

   578 

   579   The Free Software Foundation may publish revised and/or new versions of

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

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

   582 address new problems or concerns.

   583 

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

   585 Program specifies that a certain numbered version of the GNU General

   586 Public License "or any later version" applies to it, you have the

   587 option of following the terms and conditions either of that numbered

   588 version or of any later version published by the Free Software

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

   590 GNU General Public License, you may choose any version ever published

   591 by the Free Software Foundation.

   592 

   593   If the Program specifies that a proxy can decide which future

   594 versions of the GNU General Public License can be used, that proxy's

   595 public statement of acceptance of a version permanently authorizes you

   596 to choose that version for the Program.

   597 

   598   Later license versions may give you additional or different

   599 permissions.  However, no additional obligations are imposed on any

   600 author or copyright holder as a result of your choosing to follow a

   601 later version.

   602 

   603   15. Disclaimer of Warranty.

   604 

   605   THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY

   606 APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT

   607 HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY

   608 OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,

   609 THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

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

   611 IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF

   612 ALL NECESSARY SERVICING, REPAIR OR CORRECTION.

   613 

   614   16. Limitation of Liability.

   615 

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

   617 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS

   618 THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY

   619 GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE

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

   621 DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD

   622 PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),

   623 EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF

   624 SUCH DAMAGES.

   625 

   626   17. Interpretation of Sections 15 and 16.

   627 

   628   If the disclaimer of warranty and limitation of liability provided

   629 above cannot be given local legal effect according to their terms,

   630 reviewing courts shall apply local law that most closely approximates

   631 an absolute waiver of all civil liability in connection with the

   632 Program, unless a warranty or assumption of liability accompanies a

   633 copy of the Program in return for a fee.

   634 

   635                      END OF TERMS AND CONDITIONS

   636 

   637             How to Apply These Terms to Your New Programs

   638 

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

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

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

   642 

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

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

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

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

   647 

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

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

   650 

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

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

   653     the Free Software Foundation, either version 3 of the License, or

   654     (at your option) any later version.

   655 

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

   657     but WITHOUT ANY WARRANTY; without even the implied warranty of

   658     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   659     GNU General Public License for more details.

   660 

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

   662     along with this program.  If not, see <http://www.gnu.org/licenses/>.

   663 

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

   665 

   666   If the program does terminal interaction, make it output a short

   667 notice like this when it starts in an interactive mode:

   668 

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

   670     This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.

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

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

   673 

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

   675 parts of the General Public License.  Of course, your program's commands

   676 might be different; for a GUI interface, you would use an "about box".

   677 

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

   679 if any, to sign a "copyright disclaimer" for the program, if necessary.

   680 For more information on this, and how to apply and follow the GNU GPL, see

   681 <http://www.gnu.org/licenses/>.

   682 

   683   The GNU General Public License does not permit incorporating your program

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

   685 may consider it more useful to permit linking proprietary applications with

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

   687 Public License instead of this License.  But first, please read

   688 <http://www.gnu.org/philosophy/why-not-lgpl.html>.

   689 

   690 -----------------------------------------------------------------------

   691 

   692                 GNU Free Documentation License

   693                  Version 1.3, 3 November 2008

   694 

   695 

   696  Copyright (C) 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.

   697      <http://fsf.org/>

   698  Everyone is permitted to copy and distribute verbatim copies

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

   796 The "publisher" means any person or entity that distributes copies of

   797 the Document to the public.

   798 

   799 A section "Entitled XYZ" means a named subunit of the Document whose

   800 title either is precisely XYZ or contains XYZ in parentheses following

   801 text that translates XYZ in another language.  (Here XYZ stands for a

   802 specific section name mentioned below, such as "Acknowledgements",

   803 "Dedications", "Endorsements", or "History".)  To "Preserve the Title"

   804 of such a section when you modify the Document means that it remains a

   805 section "Entitled XYZ" according to this definition.

   806 

   807 The Document may include Warranty Disclaimers next to the notice which

   808 states that this License applies to the Document.  These Warranty

   809 Disclaimers are considered to be included by reference in this

   810 License, but only as regards disclaiming warranties: any other

   811 implication that these Warranty Disclaimers may have is void and has

   812 no effect on the meaning of this License.

   924 O. Preserve any Warranty Disclaimers.