├── img
├── WDM_PSD.png
├── IFTS_logo.png
├── Constellation_After_CPE.png
├── Constellation_After_LC_GAN.png
└── Constellation_After_LC_SSFM.png
├── README.md
└── LICENSE
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1 |
2 |
3 |
55 |
56 | 图1.波分复用信号功率谱密度图
57 |
58 |
59 | ### 光纤信道
60 |
61 | 当前版本的智能光传输仿真平台中，除了利用分布式傅里叶算法（SSFM）实现传输时光纤信道的仿真以外，IFTS还提供了利用生成式对抗网络（GAN, Generative Adversarial Networks）对光纤信道进行建模的NN信道仿真。NN信道仿真在保证准确率的同时能够实现光纤信道仿真的加速。如图2和图3分别为单通道，80km,入纤功率10.0dBm的条件下，采用SSFM与AI信道模型与进行传输仿真得到的收端经色散补偿后的信号星座图。
62 |
63 |
64 |
65 |
66 |
67 | 图2.分步傅里叶方法仿真传输信号收端色散补偿星座图
68 |
69 |
70 |
71 |
72 |
73 |
74 | 图3.GAN模型传输信号收端色散补偿星座图
75 |
76 |
77 |
78 | ### 信号恢复
79 |
80 | 发射端发送的光信号在经过光纤信道传输后不仅存在幅度的衰减，还存在由于光纤线性与非线性导致的信号畸变。仿真平台接收端采取一系列DSP算法，包括低通滤波，IQ平衡，色散补偿，自适应滤波，同步，载波相位估计等模块进行修正补偿，完成接收端信息恢复。如图4为收端DSP处理后的复原信号星座图。
81 |
82 |
83 |
84 |
85 |
86 | 图4.收端DSP处理后的复原信号星座图
87 |
88 |
89 | # 常见问题
90 |
91 | ## 如何下载和使用IFTS
92 |
93 | 当前阶段我们未将IFTS上传至GitHub中，所以您目前暂时无法从GitHub中直接下载与使用IFTS。您可以访问我们的 **[IFTS发布网站](https://ifibertrans.sjtu.edu.cn/)** ，登录网站后下载与使用IFTS，并参阅相关文档。
94 |
95 | ## GitHub平台的作用
96 |
97 | 虽然当前您无法直接从GitHub上获取IFTS，但是GitHub为我们提供了一个平台进行交流。您可以将您在IFTS基础上修改的代码或新增的测试通过GitHub issue进行提交；或将您遇到的Bug通过GitHub进行描述与反馈。我们将非常感谢您对IFTS的贡献。当然，我们更乐意您能够通过IFTS发布网站的[社区](https://ifibertrans.sjtu.edu.cn/community.html)与我们进行沟通与交流。
98 |
99 | ## 如何引用IFTS
100 |
101 | 如果您使用我们的智能光传输仿真平台后认为IFTS对您的的研究工作有所帮助，并且将IFTS用于出版物、报告或demo演示等，我们将非常感谢您的引用。我们提供了两种引用格式如下所示：
102 |
103 | #### MLA格式
104 |
105 | ---
106 | Zekun Niu, Hang Yang, Lyu Li, Minghui Shi, Chuyan Zeng, Chenhao Dai, Guozhi Xu, Haochen Zhao,
107 | and Lilin Yi. “Intelligent Fiber Transmission Simulation.” Intelligent Fiber Transmission
108 | Simulation Platform of Shanghai Jiao Tong University, LIFE, 2022, ifibertrans.sjtu.edu.cn/.
109 |
110 | ---
111 |
112 | #### BibTeX格式
113 |
114 | ---
115 | @misc{IFTSv0.1,
116 | author = {Zekun Niu and Hang Yang and Lyu Li and Minghui Shi and Chuyan Zeng and Chenhao
117 | Dai and Guozhi Xu and Haochen Zhao and Lilin Yi},
118 | title = {Intelligent Fiber Transmission Simulation},
119 | howpublished = {Available at \url{ifibertrans.sjtu.edu.cn}},
120 | year = 2022
121 | }
122 |
123 | ---
124 |
125 | ## 使用许可
126 |
127 | IFTS使用GNU通用公共许可证（GNU General Public License）。用户选择下载并使用本项目，即视为用户同意并遵循该协议。详细请见[LICENSE](https://ifibertrans.sjtu.edu.cn/use.html)
128 |
129 |
130 | 总而言之，我们希望借助IFTS提供算法验证平台，降低光通信智能化研究的门槛，打通信息壁垒。我们欢迎相关领域的专家下载、使用和改进IFTS，共同推动光通信的智能化发展。
131 |
132 |
133 |
134 | By 智能光纤系统实验室LIFE智能光通信团队
135 |
136 | 上海交通大学区域光纤通信网与新型光通信系统国家重点实验室
137 |
138 |
139 |
140 | -------
141 | # Introduction
142 |
143 | IFTS is an open source simulation tool for intelligent optical communication based on Python, which aims to meet the needs of scientists, optical communication engineers and researchers in related fields for optical communication simulation toolkits.Different from the traditional communication simulation tools, IFTS provides a simulation version based on Pytorch, and integrates a variety of neural network algorithms, which makes the simulation platform can accelerate the simulation with the help of GPU and neural network, naturally compatible with the intelligent algorithm design of optical communication.
144 |
145 | ### Note: At present, you cannot directly obtain IFTS and its code from GitHub. Now, GitHub only provides us with a platform for communication. If you want to use and download IFTS, you can visit our **[IFTS publishing website](https://ifibertrans.sjtu.edu.cn/)** to obtain IFTS.
146 |
147 | # Characteristic
148 |
149 | * Python based development. It's easy to use, and can be expanded based on user's own needs.
150 | * Provide efficient simulation. GPU parallel computing and AI channel model is used to accelerate intelligent simulation platform.
151 | * Open source and free. As an open source communication toolkit, IFTS is committed to assisting the intelligent research of optical communication.
152 | * Use intelligence algorithms. Focus on the forefront of optical communication, and integrate AI framework.
153 |
154 | # Available Features
155 |
156 | IFTS provides transmission simulation for complete optical communication system, which can be divided into modules such as channel, transmitter, receiver, signal and tool box. It is a comprehensive and efficient optical communication simulation kit. The following is a brief description of the modules provided by IFTS. For details, please refer to the **[user manual](https://ifibertrans.sjtu.edu.cn/manual/)** on the IFTS publication website 。
157 |
158 | ### Signal Module
159 |
160 | The signal module includes the operations related to the signal, such as the generation of signal sequence, signal modulation and demodulation, signal related performance calculation, etc., which realizes the simulation of the signal part of the simulation platform and provides the foundation for other modules.
161 |
162 | ### Channel Module
163 |
164 | The channel module is used to build the simulation channel environment and support fiber channel and AWGN channel transmission. The fiber channel simulation can be further divided into the simulation channel device module and the simulation channel transmission module. The functions realized according to the signal processing process are wavelength division multiplexing, channel transmission, demultiplexing and coherent receiving. The simulation optical fiber transmission methods supported by the platform include the distributed split-step fourier method (SSFM) and AI channel model method.
165 |
166 | ### Tx Module
167 |
168 | The Tx module realizes the simulation of the transmitter, which mainly involves the pulse shaping of the signal.
169 |
170 | ### Rx Module
171 |
172 | The Rx module realizes the simulation of the receiver, which mainly includes a variety of DSP algorithms on the receiving end, such as carrier phase estimation, adaptive filtering, dispersion compensation, IQ balance and other algorithms.
173 |
174 | ### ToolBox Module
175 |
176 | The toolbox module contains various functional functions that need to be used in the code, such as base conversion, resampling, filter design, sliding average, numerical calculation, etc., which provides basic help for simulation.
177 |
178 | # Results Presentation
179 |
180 | IFTS provides a simulation of the complete transmission process, and the results can be visualized by figure. Some of the results are shown below. For more information, please refer to the **[code running instructions](https://ifibertrans.sjtu.edu.cn/use.html)** on the IFTS distribution website.
181 |
182 | ### WDM
183 |
184 | IFTS supports the transmission of WDM signals in the channel. Figure 1 shows the schematic diagram of signal power spectral density of three-channel.
185 |
186 |
187 |
188 |
189 |
190 | Fig 1.Power spectral density diagram of WDM signal
191 |
192 |
193 | ### Fiber Channel
194 |
195 | In the current version of IFTS, in addition to using SSFM algorithm to realize the simulation of optical fiber channel during transmission, IFTS also provides NN channel simulation to model fiber optic channels using Generative Adversarial Networks (GAN). NN channel simulation can realize the acceleration of fiber channel simulation while ensuring the accuracy. In Figure 2 and Figure 3, the signal constellation of the receiver after dispersion compensation is obtained by using SSFM and AI channel model and transmission simulation under the condition of single channel, 80km and 10.0dBm power, respectively.
196 |
197 |
198 |
199 |
200 |
201 | Fig 2.Dispersion compensation constellation of SSFM model
202 |
203 |
204 |
205 |
206 |
207 |
208 | Fig 3.Dispersion compensation constellation of GAN model
209 |
210 |
211 |
212 | ### Signal Recovery
213 |
214 | The optical signal sent by the transmitter not only has amplitude attenuation after transmission through the fiber channel, but also has the signal distortion caused by the linear and nonlinear affection. The receiver of the simulation platform adopts a series of DSP algorithms, including low-pass filtering, IQ balance, dispersion compensation, adaptive filtering, synchronization, carrier phase estimation and other modules to correct compensation and complete the information recovery at the receiver. Figure 4 shows the constellation diagram of restored signal after receiver DSP.
215 |
216 |
217 |
218 |
219 |
220 | Fig 4.Constellation of recovered signal after receiver DSP
221 |
222 |
223 | # FAQs
224 |
225 | ## How to install and use IFTS
226 |
227 | At the current stage, we have not uploaded IFTS to GitHub, so you cannot directly install and use IFTS from GitHub. You can visit our **[IFTS publishing website](https://ifibertrans.sjtu.edu.cn/)**, log in to the website, install and use IFTS, and refer to relevant documents.
228 |
229 | ## The role of GitHub
230 |
231 | Although you cannot directly obtain IFTS from GitHub, GitHub provides us with a platform for communication. You can submit your modified code or new test based on IFTS through GitHub issue; Or describe and feed back the bugs you encounter through GitHub. Of course, we would like you to communicate with us through the [community](https://ifibertrans.sjtu.edu.cn/community.html) of IFTS publishing website.
232 |
233 | ## How to reference IFTS
234 |
235 | If you use our transmission simulation platform and think that IFTS is helpful to your research work, or you use IFTS for for a publication, presentation or a demo, we will appreciate your reference. We provide two reference formats as follows:
236 |
237 | #### MLA format
238 |
239 | ---
240 | Zekun Niu, Hang Yang, Lyu Li, Minghui Shi, Chuyan Zeng, Chenhao Dai, Guozhi Xu, Haochen Zhao,
241 | and Lilin Yi. “Intelligent Fiber Transmission Simulation.” Intelligent Fiber Transmission
242 | Simulation Platform of Shanghai Jiao Tong University, LIFE, 2022, ifibertrans.sjtu.edu.cn/.
243 |
244 | ---
245 |
246 | #### BibTeX format
247 |
248 | ---
249 | @misc{IFTSv0.1,
250 | author = {Zekun Niu and Hang Yang and Lyu Li and Minghui Shi and Chuyan Zeng and Chenhao
251 | Dai and Guozhi Xu and Haochen Zhao and Lilin Yi},
252 | title = {Intelligent Fiber Transmission Simulation},
253 | howpublished = {Available at \url{ifibertrans.sjtu.edu.cn}},
254 | year = 2022
255 | }
256 |
257 | ---
258 |
259 | ## Use License
260 |
261 | IFTS uses the GNU General Public License. If the user chooses to install and use our project, it is deemed that the user agrees and follows this agreement. See [LICENSE](https://ifibertrans.sjtu.edu.cn/use.html) for details.
262 |
263 |
264 |
265 | In a word, we hope to provide an algorithm verification platform with the help of IFTS, reduce the threshold of intelligent optical communication research, and break through the information barriers. Experts in related fields are welcome to download, use and improve IFTS, so as to jointly promote the intelligent development of optical communication.
266 |
267 |
268 | By Intelligent optical communication team of LIFE
269 |
270 | State Key Laboratory of Advanced Optical Communication Systems and Networks
271 |
272 |
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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
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375 |
376 | d) Limiting the use for publicity purposes of names of licensors or
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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
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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
531 | conveyed by you (or copies made from those copies), or (b) primarily
532 | for and in connection with specific products or compilations that
533 | contain the covered work, unless you entered into that arrangement,
534 | or that patent license was granted, prior to 28 March 2007.
535 |
536 | Nothing in this License shall be construed as excluding or limiting
537 | any implied license or other defenses to infringement that may
538 | otherwise be available to you under applicable patent law.
539 |
540 | 12. No Surrender of Others' Freedom.
541 |
542 | If conditions are imposed on you (whether by court order, agreement or
543 | otherwise) that contradict the conditions of this License, they do not
544 | excuse you from the conditions of this License. If you cannot convey a
545 | covered work so as to satisfy simultaneously your obligations under this
546 | License and any other pertinent obligations, then as a consequence you may
547 | not convey it at all. For example, if you agree to terms that obligate you
548 | to collect a royalty for further conveying from those to whom you convey
549 | the Program, the only way you could satisfy both those terms and this
550 | License would be to refrain entirely from conveying the Program.
551 |
552 | 13. Use with the GNU Affero General Public License.
553 |
554 | Notwithstanding any other provision of this License, you have
555 | permission to link or combine any covered work with a work licensed
556 | under version 3 of the GNU Affero General Public License into a single
557 | combined work, and to convey the resulting work. The terms of this
558 | License will continue to apply to the part which is the covered work,
559 | but the special requirements of the GNU Affero General Public License,
560 | section 13, concerning interaction through a network will apply to the
561 | combination as such.
562 |
563 | 14. Revised Versions of this License.
564 |
565 | The Free Software Foundation may publish revised and/or new versions of
566 | the GNU General Public License from time to time. Such new versions will
567 | be similar in spirit to the present version, but may differ in detail to
568 | address new problems or concerns.
569 |
570 | Each version is given a distinguishing version number. If the
571 | Program specifies that a certain numbered version of the GNU General
572 | Public License "or any later version" applies to it, you have the
573 | option of following the terms and conditions either of that numbered
574 | version or of any later version published by the Free Software
575 | Foundation. If the Program does not specify a version number of the
576 | GNU General Public License, you may choose any version ever published
577 | by the Free Software Foundation.
578 |
579 | If the Program specifies that a proxy can decide which future
580 | versions of the GNU General Public License can be used, that proxy's
581 | public statement of acceptance of a version permanently authorizes you
582 | to choose that version for the Program.
583 |
584 | Later license versions may give you additional or different
585 | permissions. However, no additional obligations are imposed on any
586 | author or copyright holder as a result of your choosing to follow a
587 | later version.
588 |
589 | 15. Disclaimer of Warranty.
590 |
591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
599 |
600 | 16. Limitation of Liability.
601 |
602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
610 | SUCH DAMAGES.
611 |
612 | 17. Interpretation of Sections 15 and 16.
613 |
614 | If the disclaimer of warranty and limitation of liability provided
615 | above cannot be given local legal effect according to their terms,
616 | reviewing courts shall apply local law that most closely approximates
617 | an absolute waiver of all civil liability in connection with the
618 | Program, unless a warranty or assumption of liability accompanies a
619 | copy of the Program in return for a fee.
620 |
621 | END OF TERMS AND CONDITIONS
622 |
623 | How to Apply These Terms to Your New Programs
624 |
625 | If you develop a new program, and you want it to be of the greatest
626 | possible use to the public, the best way to achieve this is to make it
627 | free software which everyone can redistribute and change under these terms.
628 |
629 | To do so, attach the following notices to the program. It is safest
630 | to attach them to the start of each source file to most effectively
631 | state the exclusion of warranty; and each file should have at least
632 | the "copyright" line and a pointer to where the full notice is found.
633 |
634 |
635 | Copyright (C)
636 |
637 | This program is free software: you can redistribute it and/or modify
638 | it under the terms of the GNU General Public License as published by
639 | the Free Software Foundation, either version 3 of the License, or
640 | (at your option) any later version.
641 |
642 | This program is distributed in the hope that it will be useful,
643 | but WITHOUT ANY WARRANTY; without even the implied warranty of
644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
645 | GNU General Public License for more details.
646 |
647 | You should have received a copy of the GNU General Public License
648 | along with this program. If not, see .
649 |
650 | Also add information on how to contact you by electronic and paper mail.
651 |
652 | If the program does terminal interaction, make it output a short
653 | notice like this when it starts in an interactive mode:
654 |
655 | Copyright (C)
656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
657 | This is free software, and you are welcome to redistribute it
658 | under certain conditions; type `show c' for details.
659 |
660 | The hypothetical commands `show w' and `show c' should show the appropriate
661 | parts of the General Public License. Of course, your program's commands
662 | might be different; for a GUI interface, you would use an "about box".
663 |
664 | You should also get your employer (if you work as a programmer) or school,
665 | if any, to sign a "copyright disclaimer" for the program, if necessary.
666 | For more information on this, and how to apply and follow the GNU GPL, see
667 | .
668 |
669 | The GNU General Public License does not permit incorporating your program
670 | into proprietary programs. If your program is a subroutine library, you
671 | may consider it more useful to permit linking proprietary applications with
672 | the library. If this is what you want to do, use the GNU Lesser General
673 | Public License instead of this License. But first, please read
674 | .
675 |
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