/ LICENSE
LICENSE
1 GNU LESSER GENERAL PUBLIC LICENSE 2 3 Version 2.1, February 1999 4 5 Copyright (C) 1991, 1999 Free Software Foundation, Inc. 6 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 7 8 Everyone is permitted to copy and distribute verbatim copies of this license 9 document, but changing it is not allowed. 10 11 [This is the first released version of the Lesser GPL. It also counts as 12 the successor of the GNU Library Public License, version 2, hence the version 13 number 2.1.] 14 15 Preamble 16 17 The licenses for most software are designed to take away your freedom to share 18 and change it. By contrast, the GNU General Public Licenses are intended to 19 guarantee your freedom to share and change free software--to make sure the 20 software is free for all its users. 21 22 This license, the Lesser General Public License, applies to some specially 23 designated software packages--typically libraries--of the Free Software Foundation 24 and other authors who decide to use it. You can use it too, but we suggest 25 you first think carefully about whether this license or the ordinary General 26 Public License is the better strategy to use in any particular case, based 27 on the explanations below. 28 29 When we speak of free software, we are referring to freedom of use, not price. 30 Our General Public Licenses are designed to make sure that you have the freedom 31 to distribute copies of free software (and charge for this service if you 32 wish); that you receive source code or can get it if you want it; that you 33 can change the software and use pieces of it in new free programs; and that 34 you are informed that you can do these things. 35 36 To protect your rights, we need to make restrictions that forbid distributors 37 to deny you these rights or to ask you to surrender these rights. These restrictions 38 translate to certain responsibilities for you if you distribute copies of 39 the library or if you modify it. 40 41 For example, if you distribute copies of the library, whether gratis or for 42 a fee, you must give the recipients all the rights that we gave you. You must 43 make sure that they, too, receive or can get the source code. If you link 44 other code with the library, you must provide complete object files to the 45 recipients, so that they can relink them with the library after making changes 46 to the library and recompiling it. And you must show them these terms so they 47 know their rights. 48 49 We protect your rights with a two-step method: (1) we copyright the library, 50 and (2) we offer you this license, which gives you legal permission to copy, 51 distribute and/or modify the library. 52 53 To protect each distributor, we want to make it very clear that there is no 54 warranty for the free library. Also, if the library is modified by someone 55 else and passed on, the recipients should know that what they have is not 56 the original version, so that the original author's reputation will not be 57 affected by problems that might be introduced by others. 58 59 Finally, software patents pose a constant threat to the existence of any free 60 program. We wish to make sure that a company cannot effectively restrict the 61 users of a free program by obtaining a restrictive license from a patent holder. 62 Therefore, we insist that any patent license obtained for a version of the 63 library must be consistent with the full freedom of use specified in this 64 license. 65 66 Most GNU software, including some libraries, is covered by the ordinary GNU 67 General Public License. This license, the GNU Lesser General Public License, 68 applies to certain designated libraries, and is quite different from the ordinary 69 General Public License. We use this license for certain libraries in order 70 to permit linking those libraries into non-free programs. 71 72 When a program is linked with a library, whether statically or using a shared 73 library, the combination of the two is legally speaking a combined work, a 74 derivative of the original library. The ordinary General Public License therefore 75 permits such linking only if the entire combination fits its criteria of freedom. 76 The Lesser General Public License permits more lax criteria for linking other 77 code with the library. 78 79 We call this license the "Lesser" General Public License because it does Less 80 to protect the user's freedom than the ordinary General Public License. It 81 also provides other free software developers Less of an advantage over competing 82 non-free programs. These disadvantages are the reason we use the ordinary 83 General Public License for many libraries. However, the Lesser license provides 84 advantages in certain special circumstances. 85 86 For example, on rare occasions, there may be a special need to encourage the 87 widest possible use of a certain library, so that it becomes a de-facto standard. 88 To achieve this, non-free programs must be allowed to use the library. A more 89 frequent case is that a free library does the same job as widely used non-free 90 libraries. In this case, there is little to gain by limiting the free library 91 to free software only, so we use the Lesser General Public License. 92 93 In other cases, permission to use a particular library in non-free programs 94 enables a greater number of people to use a large body of free software. For 95 example, permission to use the GNU C Library in non-free programs enables 96 many more people to use the whole GNU operating system, as well as its variant, 97 the GNU/Linux operating system. 98 99 Although the Lesser General Public License is Less protective of the users' 100 freedom, it does ensure that the user of a program that is linked with the 101 Library has the freedom and the wherewithal to run that program using a modified 102 version of the Library. 103 104 The precise terms and conditions for copying, distribution and modification 105 follow. Pay close attention to the difference between a "work based on the 106 library" and a "work that uses the library". The former contains code derived 107 from the library, whereas the latter must be combined with the library in 108 order to run. 109 110 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 111 112 0. This License Agreement applies to any software library or other program 113 which contains a notice placed by the copyright holder or other authorized 114 party saying it may be distributed under the terms of this Lesser General 115 Public License (also called "this License"). Each licensee is addressed as 116 "you". 117 118 A "library" means a collection of software functions and/or data prepared 119 so as to be conveniently linked with application programs (which use some 120 of those functions and data) to form executables. 121 122 The "Library", below, refers to any such software library or work which has 123 been distributed under these terms. A "work based on the Library" means either 124 the Library or any derivative work under copyright law: that is to say, a 125 work containing the Library or a portion of it, either verbatim or with modifications 126 and/or translated straightforwardly into another language. (Hereinafter, translation 127 is included without limitation in the term "modification".) 128 129 "Source code" for a work means the preferred form of the work for making modifications 130 to it. For a library, complete source code means all the source code for all 131 modules it contains, plus any associated interface definition files, plus 132 the scripts used to control compilation and installation of the library. 133 134 Activities other than copying, distribution and modification are not covered 135 by this License; they are outside its scope. The act of running a program 136 using the Library is not restricted, and output from such a program is covered 137 only if its contents constitute a work based on the Library (independent of 138 the use of the Library in a tool for writing it). Whether that is true depends 139 on what the Library does and what the program that uses the Library does. 140 141 1. You may copy and distribute verbatim copies of the Library's complete source 142 code as you receive it, in any medium, provided that you conspicuously and 143 appropriately publish on each copy an appropriate copyright notice and disclaimer 144 of warranty; keep intact all the notices that refer to this License and to 145 the absence of any warranty; and distribute a copy of this License along with 146 the Library. 147 148 You may charge a fee for the physical act of transferring a copy, and you 149 may at your option offer warranty protection in exchange for a fee. 150 151 2. You may modify your copy or copies of the Library or any portion of it, 152 thus forming a work based on the Library, and copy and distribute such modifications 153 or work under the terms of Section 1 above, provided that you also meet all 154 of these conditions: 155 156 a) The modified work must itself be a software library. 157 158 b) You must cause the files modified to carry prominent notices stating that 159 you changed the files and the date of any change. 160 161 c) You must cause the whole of the work to be licensed at no charge to all 162 third parties under the terms of this License. 163 164 d) If a facility in the modified Library refers to a function or a table of 165 data to be supplied by an application program that uses the facility, other 166 than as an argument passed when the facility is invoked, then you must make 167 a good faith effort to ensure that, in the event an application does not supply 168 such function or table, the facility still operates, and performs whatever 169 part of its purpose remains meaningful. 170 171 (For example, a function in a library to compute square roots has a purpose 172 that is entirely well-defined independent of the application. Therefore, Subsection 173 2d requires that any application-supplied function or table used by this function 174 must be optional: if the application does not supply it, the square root function 175 must still compute square roots.) 176 177 These requirements apply to the modified work as a whole. If identifiable 178 sections of that work are not derived from the Library, and can be reasonably 179 considered independent and separate works in themselves, then this License, 180 and its terms, do not apply to those sections when you distribute them as 181 separate works. But when you distribute the same sections as part of a whole 182 which is a work based on the Library, the distribution of the whole must be 183 on the terms of this License, whose permissions for other licensees extend 184 to the entire whole, and thus to each and every part regardless of who wrote 185 it. 186 187 Thus, it is not the intent of this section to claim rights or contest your 188 rights to work written entirely by you; rather, the intent is to exercise 189 the right to control the distribution of derivative or collective works based 190 on the Library. 191 192 In addition, mere aggregation of another work not based on the Library with 193 the Library (or with a work based on the Library) on a volume of a storage 194 or distribution medium does not bring the other work under the scope of this 195 License. 196 197 3. You may opt to apply the terms of the ordinary GNU General Public License 198 instead of this License to a given copy of the Library. To do this, you must 199 alter all the notices that refer to this License, so that they refer to the 200 ordinary GNU General Public License, version 2, instead of to this License. 201 (If a newer version than version 2 of the ordinary GNU General Public License 202 has appeared, then you can specify that version instead if you wish.) Do not 203 make any other change in these notices. 204 205 Once this change is made in a given copy, it is irreversible for that copy, 206 so the ordinary GNU General Public License applies to all subsequent copies 207 and derivative works made from that copy. 208 209 This option is useful when you wish to copy part of the code of the Library 210 into a program that is not a library. 211 212 4. You may copy and distribute the Library (or a portion or derivative of 213 it, under Section 2) in object code or executable form under the terms of 214 Sections 1 and 2 above provided that you accompany it with the complete corresponding 215 machine-readable source code, which must be distributed under the terms of 216 Sections 1 and 2 above on a medium customarily used for software interchange. 217 218 If distribution of object code is made by offering access to copy from a designated 219 place, then offering equivalent access to copy the source code from the same 220 place satisfies the requirement to distribute the source code, even though 221 third parties are not compelled to copy the source along with the object code. 222 223 5. A program that contains no derivative of any portion of the Library, but 224 is designed to work with the Library by being compiled or linked with it, 225 is called a "work that uses the Library". Such a work, in isolation, is not 226 a derivative work of the Library, and therefore falls outside the scope of 227 this License. 228 229 However, linking a "work that uses the Library" with the Library creates an 230 executable that is a derivative of the Library (because it contains portions 231 of the Library), rather than a "work that uses the library". The executable 232 is therefore covered by this License. Section 6 states terms for distribution 233 of such executables. 234 235 When a "work that uses the Library" uses material from a header file that 236 is part of the Library, the object code for the work may be a derivative work 237 of the Library even though the source code is not. Whether this is true is 238 especially significant if the work can be linked without the Library, or if 239 the work is itself a library. The threshold for this to be true is not precisely 240 defined by law. 241 242 If such an object file uses only numerical parameters, data structure layouts 243 and accessors, and small macros and small inline functions (ten lines or less 244 in length), then the use of the object file is unrestricted, regardless of 245 whether it is legally a derivative work. (Executables containing this object 246 code plus portions of the Library will still fall under Section 6.) 247 248 Otherwise, if the work is a derivative of the Library, you may distribute 249 the object code for the work under the terms of Section 6. Any executables 250 containing that work also fall under Section 6, whether or not they are linked 251 directly with the Library itself. 252 253 6. As an exception to the Sections above, you may also combine or link a "work 254 that uses the Library" with the Library to produce a work containing portions 255 of the Library, and distribute that work under terms of your choice, provided 256 that the terms permit modification of the work for the customer's own use 257 and reverse engineering for debugging such modifications. 258 259 You must give prominent notice with each copy of the work that the Library 260 is used in it and that the Library and its use are covered by this License. 261 You must supply a copy of this License. If the work during execution displays 262 copyright notices, you must include the copyright notice for the Library among 263 them, as well as a reference directing the user to the copy of this License. 264 Also, you must do one of these things: 265 266 a) Accompany the work with the complete corresponding machine-readable source 267 code for the Library including whatever changes were used in the work (which 268 must be distributed under Sections 1 and 2 above); and, if the work is an 269 executable linked with the Library, with the complete machine-readable "work 270 that uses the Library", as object code and/or source code, so that the user 271 can modify the Library and then relink to produce a modified executable containing 272 the modified Library. (It is understood that the user who changes the contents 273 of definitions files in the Library will not necessarily be able to recompile 274 the application to use the modified definitions.) 275 276 b) Use a suitable shared library mechanism for linking with the Library. A 277 suitable mechanism is one that (1) uses at run time a copy of the library 278 already present on the user's computer system, rather than copying library 279 functions into the executable, and (2) will operate properly with a modified 280 version of the library, if the user installs one, as long as the modified 281 version is interface-compatible with the version that the work was made with. 282 283 c) Accompany the work with a written offer, valid for at least three years, 284 to give the same user the materials specified in Subsection 6a, above, for 285 a charge no more than the cost of performing this distribution. 286 287 d) If distribution of the work is made by offering access to copy from a designated 288 place, offer equivalent access to copy the above specified materials from 289 the same place. 290 291 e) Verify that the user has already received a copy of these materials or 292 that you have already sent this user a copy. 293 294 For an executable, the required form of the "work that uses the Library" must 295 include any data and utility programs needed for reproducing the executable 296 from it. However, as a special exception, the materials to be distributed 297 need not include anything that is normally distributed (in either source or 298 binary form) with the major components (compiler, kernel, and so on) of the 299 operating system on which the executable runs, unless that component itself 300 accompanies the executable. 301 302 It may happen that this requirement contradicts the license restrictions of 303 other proprietary libraries that do not normally accompany the operating system. 304 Such a contradiction means you cannot use both them and the Library together 305 in an executable that you distribute. 306 307 7. You may place library facilities that are a work based on the Library side-by-side 308 in a single library together with other library facilities not covered by 309 this License, and distribute such a combined library, provided that the separate 310 distribution of the work based on the Library and of the other library facilities 311 is otherwise permitted, and provided that you do these two things: 312 313 a) Accompany the combined library with a copy of the same work based on the 314 Library, uncombined with any other library facilities. This must be distributed 315 under the terms of the Sections above. 316 317 b) Give prominent notice with the combined library of the fact that part of 318 it is a work based on the Library, and explaining where to find the accompanying 319 uncombined form of the same work. 320 321 8. You may not copy, modify, sublicense, link with, or distribute the Library 322 except as expressly provided under this License. Any attempt otherwise to 323 copy, modify, sublicense, link with, or distribute the Library is void, and 324 will automatically terminate your rights under this License. However, parties 325 who have received copies, or rights, from you under this License will not 326 have their licenses terminated so long as such parties remain in full compliance. 327 328 9. You are not required to accept this License, since you have not signed 329 it. However, nothing else grants you permission to modify or distribute the 330 Library or its derivative works. These actions are prohibited by law if you 331 do not accept this License. Therefore, by modifying or distributing the Library 332 (or any work based on the Library), you indicate your acceptance of this License 333 to do so, and all its terms and conditions for copying, distributing or modifying 334 the Library or works based on it. 335 336 10. Each time you redistribute the Library (or any work based on the Library), 337 the recipient automatically receives a license from the original licensor 338 to copy, distribute, link with or modify the Library subject to these terms 339 and conditions. You may not impose any further restrictions on the recipients' 340 exercise of the rights granted herein. You are not responsible for enforcing 341 compliance by third parties with this License. 342 343 11. If, as a consequence of a court judgment or allegation of patent infringement 344 or for any other reason (not limited to patent issues), conditions are imposed 345 on you (whether by court order, agreement or otherwise) that contradict the 346 conditions of this License, they do not excuse you from the conditions of 347 this License. If you cannot distribute so as to satisfy simultaneously your 348 obligations under this License and any other pertinent obligations, then as 349 a consequence you may not distribute the Library at all. For example, if a 350 patent license would not permit royalty-free redistribution of the Library 351 by all those who receive copies directly or indirectly through you, then the 352 only way you could satisfy both it and this License would be to refrain entirely 353 from distribution of the Library. 354 355 If any portion of this section is held invalid or unenforceable under any 356 particular circumstance, the balance of the section is intended to apply, 357 and the section as a whole is intended to apply in other circumstances. 358 359 It is not the purpose of this section to induce you to infringe any patents 360 or other property right claims or to contest validity of any such claims; 361 this section has the sole purpose of protecting the integrity of the free 362 software distribution system which is implemented by public license practices. 363 Many people have made generous contributions to the wide range of software 364 distributed through that system in reliance on consistent application of that 365 system; it is up to the author/donor to decide if he or she is willing to 366 distribute software through any other system and a licensee cannot impose 367 that choice. 368 369 This section is intended to make thoroughly clear what is believed to be a 370 consequence of the rest of this License. 371 372 12. If the distribution and/or use of the Library is restricted in certain 373 countries either by patents or by copyrighted interfaces, the original copyright 374 holder who places the Library under this License may add an explicit geographical 375 distribution limitation excluding those countries, so that distribution is 376 permitted only in or among countries not thus excluded. In such case, this 377 License incorporates the limitation as if written in the body of this License. 378 379 13. The Free Software Foundation may publish revised and/or new versions of 380 the Lesser General Public License from time to time. Such new versions will 381 be similar in spirit to the present version, but may differ in detail to address 382 new problems or concerns. 383 384 Each version is given a distinguishing version number. If the Library specifies 385 a version number of this License which applies to it and "any later version", 386 you have the option of following the terms and conditions either of that version 387 or of any later version published by the Free Software Foundation. If the 388 Library does not specify a license version number, you may choose any version 389 ever published by the Free Software Foundation. 390 391 14. If you wish to incorporate parts of the Library into other free programs 392 whose distribution conditions are incompatible with these, write to the author 393 to ask for permission. For software which is copyrighted by the Free Software 394 Foundation, write to the Free Software Foundation; we sometimes make exceptions 395 for this. Our decision will be guided by the two goals of preserving the free 396 status of all derivatives of our free software and of promoting the sharing 397 and reuse of software generally. 398 399 NO WARRANTY 400 401 15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR 402 THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE 403 STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE LIBRARY 404 "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, 405 BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 406 FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE 407 OF THE LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME 408 THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 409 410 16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 411 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE 412 THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 413 GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE 414 OR INABILITY TO USE THE LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA 415 OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES 416 OR A FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF SUCH 417 HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 418 419 END OF TERMS AND CONDITIONS 420 421 How to Apply These Terms to Your New Libraries 422 423 If you develop a new library, and you want it to be of the greatest possible 424 use to the public, we recommend making it free software that everyone can 425 redistribute and change. You can do so by permitting redistribution under 426 these terms (or, alternatively, under the terms of the ordinary General Public 427 License). 428 429 To apply these terms, attach the following notices to the library. It is safest 430 to attach them to the start of each source file to most effectively convey 431 the exclusion of warranty; and each file should have at least the "copyright" 432 line and a pointer to where the full notice is found. 433 434 one line to give the library's name and an idea of what it does. 435 Copyright (C) year name of author 436 437 This library is free software; you can redistribute it and/or modify it under 438 the terms of the GNU Lesser General Public License as published by the Free 439 Software Foundation; either version 2.1 of the License, or (at your option) 440 any later version. 441 442 This library is distributed in the hope that it will be useful, but WITHOUT 443 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 444 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more 445 details. 446 447 You should have received a copy of the GNU Lesser General Public License along 448 with this library; if not, write to the Free Software Foundation, Inc., 51 449 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA Also add information 450 on how to contact you by electronic and paper mail. 451 452 You should also get your employer (if you work as a programmer) or your school, 453 if any, to sign a "copyright disclaimer" for the library, if necessary. Here 454 is a sample; alter the names: 455 456 Yoyodyne, Inc., hereby disclaims all copyright interest in 457 the library `Frob' (a library for tweaking knobs) written 458 by James Random Hacker. 459 460 signature of Ty Coon, 1 April 1990 461 Ty Coon, President of Vice 462 That's all there is to it!