Plain Text | 502 lines | 427 code | 75 blank | 0 comment | 0 complexity | 4fbd65380cdd255951079008b364516c MD5 | raw file
1 GNU LESSER GENERAL PUBLIC LICENSE 2 Version 2.1, February 1999 3 4 Copyright (C) 1991, 1999 Free Software Foundation, Inc. 5 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 Everyone is permitted to copy and distribute verbatim copies 7 of this license document, but changing it is not allowed. 8 9[This is the first released version of the Lesser GPL. It also counts 10 as the successor of the GNU Library Public License, version 2, hence 11 the version number 2.1.] 12 13 Preamble 14 15 The licenses for most software are designed to take away your 16freedom to share and change it. By contrast, the GNU General Public 17Licenses are intended to guarantee your freedom to share and change 18free software--to make sure the software is free for all its users. 19 20 This license, the Lesser General Public License, applies to some 21specially designated software packages--typically libraries--of the 22Free Software Foundation and other authors who decide to use it. You 23can use it too, but we suggest you first think carefully about whether 24this license or the ordinary General Public License is the better 25strategy to use in any particular case, based on the explanations below. 26 27 When we speak of free software, we are referring to freedom of use, 28not price. Our General Public Licenses are designed to make sure that 29you have the freedom to distribute copies of free software (and charge 30for this service if you wish); that you receive source code or can get 31it if you want it; that you can change the software and use pieces of 32it in new free programs; and that you are informed that you can do 33these things. 34 35 To protect your rights, we need to make restrictions that forbid 36distributors to deny you these rights or to ask you to surrender these 37rights. These restrictions translate to certain responsibilities for 38you if you distribute copies of the library or if you modify it. 39 40 For example, if you distribute copies of the library, whether gratis 41or for a fee, you must give the recipients all the rights that we gave 42you. You must make sure that they, too, receive or can get the source 43code. If you link other code with the library, you must provide 44complete object files to the recipients, so that they can relink them 45with the library after making changes to the library and recompiling 46it. And you must show them these terms so they know their rights. 47 48 We protect your rights with a two-step method: (1) we copyright the 49library, and (2) we offer you this license, which gives you legal 50permission to copy, distribute and/or modify the library. 51 52 To protect each distributor, we want to make it very clear that 53there is no warranty for the free library. Also, if the library is 54modified by someone else and passed on, the recipients should know 55that what they have is not the original version, so that the original 56author's reputation will not be affected by problems that might be 57introduced by others. 58 59 Finally, software patents pose a constant threat to the existence of 60any free program. We wish to make sure that a company cannot 61effectively restrict the users of a free program by obtaining a 62restrictive license from a patent holder. Therefore, we insist that 63any patent license obtained for a version of the library must be 64consistent with the full freedom of use specified in this license. 65 66 Most GNU software, including some libraries, is covered by the 67ordinary GNU General Public License. This license, the GNU Lesser 68General Public License, applies to certain designated libraries, and 69is quite different from the ordinary General Public License. We use 70this license for certain libraries in order to permit linking those 71libraries into non-free programs. 72 73 When a program is linked with a library, whether statically or using 74a shared library, the combination of the two is legally speaking a 75combined work, a derivative of the original library. The ordinary 76General Public License therefore permits such linking only if the 77entire combination fits its criteria of freedom. The Lesser General 78Public License permits more lax criteria for linking other code with 79the library. 80 81 We call this license the "Lesser" General Public License because it 82does Less to protect the user's freedom than the ordinary General 83Public License. It also provides other free software developers Less 84of an advantage over competing non-free programs. These disadvantages 85are the reason we use the ordinary General Public License for many 86libraries. However, the Lesser license provides advantages in certain 87special circumstances. 88 89 For example, on rare occasions, there may be a special need to 90encourage the widest possible use of a certain library, so that it becomes 91a de-facto standard. To achieve this, non-free programs must be 92allowed to use the library. A more frequent case is that a free 93library does the same job as widely used non-free libraries. In this 94case, there is little to gain by limiting the free library to free 95software only, so we use the Lesser General Public License. 96 97 In other cases, permission to use a particular library in non-free 98programs enables a greater number of people to use a large body of 99free software. For example, permission to use the GNU C Library in 100non-free programs enables many more people to use the whole GNU 101operating system, as well as its variant, the GNU/Linux operating 102system. 103 104 Although the Lesser General Public License is Less protective of the 105users' freedom, it does ensure that the user of a program that is 106linked with the Library has the freedom and the wherewithal to run 107that program using a modified version of the Library. 108 109 The precise terms and conditions for copying, distribution and 110modification follow. Pay close attention to the difference between a 111"work based on the library" and a "work that uses the library". The 112former contains code derived from the library, whereas the latter must 113be combined with the library in order to run. 114 115 GNU LESSER GENERAL PUBLIC LICENSE 116 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 117 118 0. This License Agreement applies to any software library or other 119program which contains a notice placed by the copyright holder or 120other authorized party saying it may be distributed under the terms of 121this Lesser General Public License (also called "this License"). 122Each licensee is addressed as "you". 123 124 A "library" means a collection of software functions and/or data 125prepared so as to be conveniently linked with application programs 126(which use some of those functions and data) to form executables. 127 128 The "Library", below, refers to any such software library or work 129which has been distributed under these terms. A "work based on the 130Library" means either the Library or any derivative work under 131copyright law: that is to say, a work containing the Library or a 132portion of it, either verbatim or with modifications and/or translated 133straightforwardly into another language. (Hereinafter, translation is 134included without limitation in the term "modification".) 135 136 "Source code" for a work means the preferred form of the work for 137making modifications to it. For a library, complete source code means 138all the source code for all modules it contains, plus any associated 139interface definition files, plus the scripts used to control compilation 140and installation of the library. 141 142 Activities other than copying, distribution and modification are not 143covered by this License; they are outside its scope. The act of 144running a program using the Library is not restricted, and output from 145such a program is covered only if its contents constitute a work based 146on the Library (independent of the use of the Library in a tool for 147writing it). Whether that is true depends on what the Library does 148and what the program that uses the Library does. 149 150 1. You may copy and distribute verbatim copies of the Library's 151complete source code as you receive it, in any medium, provided that 152you conspicuously and appropriately publish on each copy an 153appropriate copyright notice and disclaimer of warranty; keep intact 154all the notices that refer to this License and to the absence of any 155warranty; and distribute a copy of this License along with the 156Library. 157 158 You may charge a fee for the physical act of transferring a copy, 159and you may at your option offer warranty protection in exchange for a 160fee. 161 162 2. You may modify your copy or copies of the Library or any portion 163of it, thus forming a work based on the Library, and copy and 164distribute such modifications or work under the terms of Section 1 165above, provided that you also meet all of these conditions: 166 167 a) The modified work must itself be a software library. 168 169 b) You must cause the files modified to carry prominent notices 170 stating that you changed the files and the date of any change. 171 172 c) You must cause the whole of the work to be licensed at no 173 charge to all third parties under the terms of this License. 174 175 d) If a facility in the modified Library refers to a function or a 176 table of data to be supplied by an application program that uses 177 the facility, other than as an argument passed when the facility 178 is invoked, then you must make a good faith effort to ensure that, 179 in the event an application does not supply such function or 180 table, the facility still operates, and performs whatever part of 181 its purpose remains meaningful. 182 183 (For example, a function in a library to compute square roots has 184 a purpose that is entirely well-defined independent of the 185 application. Therefore, Subsection 2d requires that any 186 application-supplied function or table used by this function must 187 be optional: if the application does not supply it, the square 188 root function must still compute square roots.) 189 190These requirements apply to the modified work as a whole. If 191identifiable sections of that work are not derived from the Library, 192and can be reasonably considered independent and separate works in 193themselves, then this License, and its terms, do not apply to those 194sections when you distribute them as separate works. But when you 195distribute the same sections as part of a whole which is a work based 196on the Library, the distribution of the whole must be on the terms of 197this License, whose permissions for other licensees extend to the 198entire whole, and thus to each and every part regardless of who wrote 199it. 200 201Thus, it is not the intent of this section to claim rights or contest 202your rights to work written entirely by you; rather, the intent is to 203exercise the right to control the distribution of derivative or 204collective works based on the Library. 205 206In addition, mere aggregation of another work not based on the Library 207with the Library (or with a work based on the Library) on a volume of 208a storage or distribution medium does not bring the other work under 209the scope of this License. 210 211 3. You may opt to apply the terms of the ordinary GNU General Public 212License instead of this License to a given copy of the Library. To do 213this, you must alter all the notices that refer to this License, so 214that they refer to the ordinary GNU General Public License, version 2, 215instead of to this License. (If a newer version than version 2 of the 216ordinary GNU General Public License has appeared, then you can specify 217that version instead if you wish.) Do not make any other change in 218these notices. 219 220 Once this change is made in a given copy, it is irreversible for 221that copy, so the ordinary GNU General Public License applies to all 222subsequent copies and derivative works made from that copy. 223 224 This option is useful when you wish to copy part of the code of 225the Library into a program that is not a library. 226 227 4. You may copy and distribute the Library (or a portion or 228derivative of it, under Section 2) in object code or executable form 229under the terms of Sections 1 and 2 above provided that you accompany 230it with the complete corresponding machine-readable source code, which 231must be distributed under the terms of Sections 1 and 2 above on a 232medium customarily used for software interchange. 233 234 If distribution of object code is made by offering access to copy 235from a designated place, then offering equivalent access to copy the 236source code from the same place satisfies the requirement to 237distribute the source code, even though third parties are not 238compelled to copy the source along with the object code. 239 240 5. A program that contains no derivative of any portion of the 241Library, but is designed to work with the Library by being compiled or 242linked with it, is called a "work that uses the Library". Such a 243work, in isolation, is not a derivative work of the Library, and 244therefore falls outside the scope of this License. 245 246 However, linking a "work that uses the Library" with the Library 247creates an executable that is a derivative of the Library (because it 248contains portions of the Library), rather than a "work that uses the 249library". The executable is therefore covered by this License. 250Section 6 states terms for distribution of such executables. 251 252 When a "work that uses the Library" uses material from a header file 253that is part of the Library, the object code for the work may be a 254derivative work of the Library even though the source code is not. 255Whether this is true is especially significant if the work can be 256linked without the Library, or if the work is itself a library. The 257threshold for this to be true is not precisely defined by law. 258 259 If such an object file uses only numerical parameters, data 260structure layouts and accessors, and small macros and small inline 261functions (ten lines or less in length), then the use of the object 262file is unrestricted, regardless of whether it is legally a derivative 263work. (Executables containing this object code plus portions of the 264Library will still fall under Section 6.) 265 266 Otherwise, if the work is a derivative of the Library, you may 267distribute the object code for the work under the terms of Section 6. 268Any executables containing that work also fall under Section 6, 269whether or not they are linked directly with the Library itself. 270 271 6. As an exception to the Sections above, you may also combine or 272link a "work that uses the Library" with the Library to produce a 273work containing portions of the Library, and distribute that work 274under terms of your choice, provided that the terms permit 275modification of the work for the customer's own use and reverse 276engineering for debugging such modifications. 277 278 You must give prominent notice with each copy of the work that the 279Library is used in it and that the Library and its use are covered by 280this License. You must supply a copy of this License. If the work 281during execution displays copyright notices, you must include the 282copyright notice for the Library among them, as well as a reference 283directing the user to the copy of this License. Also, you must do one 284of these things: 285 286 a) Accompany the work with the complete corresponding 287 machine-readable source code for the Library including whatever 288 changes were used in the work (which must be distributed under 289 Sections 1 and 2 above); and, if the work is an executable linked 290 with the Library, with the complete machine-readable "work that 291 uses the Library", as object code and/or source code, so that the 292 user can modify the Library and then relink to produce a modified 293 executable containing the modified Library. (It is understood 294 that the user who changes the contents of definitions files in the 295 Library will not necessarily be able to recompile the application 296 to use the modified definitions.) 297 298 b) Use a suitable shared library mechanism for linking with the 299 Library. A suitable mechanism is one that (1) uses at run time a 300 copy of the library already present on the user's computer system, 301 rather than copying library functions into the executable, and (2) 302 will operate properly with a modified version of the library, if 303 the user installs one, as long as the modified version is 304 interface-compatible with the version that the work was made with. 305 306 c) Accompany the work with a written offer, valid for at 307 least three years, to give the same user the materials 308 specified in Subsection 6a, above, for a charge no more 309 than the cost of performing this distribution. 310 311 d) If distribution of the work is made by offering access to copy 312 from a designated place, offer equivalent access to copy the above 313 specified materials from the same place. 314 315 e) Verify that the user has already received a copy of these 316 materials or that you have already sent this user a copy. 317 318 For an executable, the required form of the "work that uses the 319Library" must include any data and utility programs needed for 320reproducing the executable from it. However, as a special exception, 321the materials to be distributed need not include anything that is 322normally distributed (in either source or binary form) with the major 323components (compiler, kernel, and so on) of the operating system on 324which the executable runs, unless that component itself accompanies 325the executable. 326 327 It may happen that this requirement contradicts the license 328restrictions of other proprietary libraries that do not normally 329accompany the operating system. Such a contradiction means you cannot 330use both them and the Library together in an executable that you 331distribute. 332 333 7. You may place library facilities that are a work based on the 334Library side-by-side in a single library together with other library 335facilities not covered by this License, and distribute such a combined 336library, provided that the separate distribution of the work based on 337the Library and of the other library facilities is otherwise 338permitted, and provided that you do these two things: 339 340 a) Accompany the combined library with a copy of the same work 341 based on the Library, uncombined with any other library 342 facilities. This must be distributed under the terms of the 343 Sections above. 344 345 b) Give prominent notice with the combined library of the fact 346 that part of it is a work based on the Library, and explaining 347 where to find the accompanying uncombined form of the same work. 348 349 8. You may not copy, modify, sublicense, link with, or distribute 350the Library except as expressly provided under this License. Any 351attempt otherwise to copy, modify, sublicense, link with, or 352distribute the Library is void, and will automatically terminate your 353rights under this License. However, parties who have received copies, 354or rights, from you under this License will not have their licenses 355terminated so long as such parties remain in full compliance. 356 357 9. You are not required to accept this License, since you have not 358signed it. However, nothing else grants you permission to modify or 359distribute the Library or its derivative works. These actions are 360prohibited by law if you do not accept this License. Therefore, by 361modifying or distributing the Library (or any work based on the 362Library), you indicate your acceptance of this License to do so, and 363all its terms and conditions for copying, distributing or modifying 364the Library or works based on it. 365 366 10. Each time you redistribute the Library (or any work based on the 367Library), the recipient automatically receives a license from the 368original licensor to copy, distribute, link with or modify the Library 369subject to these terms and conditions. You may not impose any further 370restrictions on the recipients' exercise of the rights granted herein. 371You are not responsible for enforcing compliance by third parties with 372this License. 373 374 11. If, as a consequence of a court judgment or allegation of patent 375infringement or for any other reason (not limited to patent issues), 376conditions are imposed on you (whether by court order, agreement or 377otherwise) that contradict the conditions of this License, they do not 378excuse you from the conditions of this License. If you cannot 379distribute so as to satisfy simultaneously your obligations under this 380License and any other pertinent obligations, then as a consequence you 381may not distribute the Library at all. For example, if a patent 382license would not permit royalty-free redistribution of the Library by 383all those who receive copies directly or indirectly through you, then 384the only way you could satisfy both it and this License would be to 385refrain entirely from distribution of the Library. 386 387If any portion of this section is held invalid or unenforceable under any 388particular circumstance, the balance of the section is intended to apply, 389and the section as a whole is intended to apply in other circumstances. 390 391It is not the purpose of this section to induce you to infringe any 392patents or other property right claims or to contest validity of any 393such claims; this section has the sole purpose of protecting the 394integrity of the free software distribution system which is 395implemented by public license practices. Many people have made 396generous contributions to the wide range of software distributed 397through that system in reliance on consistent application of that 398system; it is up to the author/donor to decide if he or she is willing 399to distribute software through any other system and a licensee cannot 400impose that choice. 401 402This section is intended to make thoroughly clear what is believed to 403be a consequence of the rest of this License. 404 405 12. If the distribution and/or use of the Library is restricted in 406certain countries either by patents or by copyrighted interfaces, the 407original copyright holder who places the Library under this License may add 408an explicit geographical distribution limitation excluding those countries, 409so that distribution is permitted only in or among countries not thus 410excluded. In such case, this License incorporates the limitation as if 411written in the body of this License. 412 413 13. The Free Software Foundation may publish revised and/or new 414versions of the Lesser General Public License from time to time. 415Such new versions will be similar in spirit to the present version, 416but may differ in detail to address new problems or concerns. 417 418Each version is given a distinguishing version number. If the Library 419specifies a version number of this License which applies to it and 420"any later version", you have the option of following the terms and 421conditions either of that version or of any later version published by 422the Free Software Foundation. If the Library does not specify a 423license version number, you may choose any version ever published by 424the Free Software Foundation. 425 426 14. If you wish to incorporate parts of the Library into other free 427programs whose distribution conditions are incompatible with these, 428write to the author to ask for permission. For software which is 429copyrighted by the Free Software Foundation, write to the Free 430Software Foundation; we sometimes make exceptions for this. Our 431decision will be guided by the two goals of preserving the free status 432of all derivatives of our free software and of promoting the sharing 433and reuse of software generally. 434 435 NO WARRANTY 436 437 15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO 438WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW. 439EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR 440OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY 441KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE 442IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 443PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE 444LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME 445THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 446 447 16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN 448WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY 449AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU 450FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR 451CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE 452LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING 453RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A 454FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF 455SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 456DAMAGES. 457 458 END OF TERMS AND CONDITIONS 459 460 How to Apply These Terms to Your New Libraries 461 462 If you develop a new library, and you want it to be of the greatest 463possible use to the public, we recommend making it free software that 464everyone can redistribute and change. You can do so by permitting 465redistribution under these terms (or, alternatively, under the terms of the 466ordinary General Public License). 467 468 To apply these terms, attach the following notices to the library. It is 469safest to attach them to the start of each source file to most effectively 470convey the exclusion of warranty; and each file should have at least the 471"copyright" line and a pointer to where the full notice is found. 472 473 <one line to give the library's name and a brief idea of what it does.> 474 Copyright (C) <year> <name of author> 475 476 This library is free software; you can redistribute it and/or 477 modify it under the terms of the GNU Lesser General Public 478 License as published by the Free Software Foundation; either 479 version 2.1 of the License, or (at your option) any later version. 480 481 This library is distributed in the hope that it will be useful, 482 but WITHOUT ANY WARRANTY; without even the implied warranty of 483 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 484 Lesser General Public License for more details. 485 486 You should have received a copy of the GNU Lesser General Public 487 License along with this library; if not, write to the Free Software 488 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 489 490Also add information on how to contact you by electronic and paper mail. 491 492You should also get your employer (if you work as a programmer) or your 493school, if any, to sign a "copyright disclaimer" for the library, if 494necessary. Here is a sample; alter the names: 495 496 Yoyodyne, Inc., hereby disclaims all copyright interest in the 497 library `Frob' (a library for tweaking knobs) written by James Random Hacker. 498 499 <signature of Ty Coon>, 1 April 1990 500 Ty Coon, President of Vice 501 502That's all there is to it!