1Note that the only valid version of the LGPL as far as the files in 2this directory (and its subdirectories) are concerned is _this_ 3particular version of the license (i.e., *only* v2.1, not v2.2 or v3.x 4or whatever), unless explicitly otherwise stated. 5 6Where clause 3 is invoked in order to relicense under the GPL then 7this shall be considered to be GPL v2 only for files which have 8specified LGPL v2.1 only. 9 10 GNU LESSER GENERAL PUBLIC LICENSE 11 Version 2.1, February 1999 12 13 Copyright (C) 1991, 1999 Free Software Foundation, Inc. 14 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 15 Everyone is permitted to copy and distribute verbatim copies 16 of this license document, but changing it is not allowed. 17 18[This is the first released version of the Lesser GPL. It also counts 19 as the successor of the GNU Library Public License, version 2, hence 20 the version number 2.1.] 21 22 Preamble 23 24 The licenses for most software are designed to take away your 25freedom to share and change it. By contrast, the GNU General Public 26Licenses are intended to guarantee your freedom to share and change 27free software--to make sure the software is free for all its users. 28 29 This license, the Lesser General Public License, applies to some 30specially designated software packages--typically libraries--of the 31Free Software Foundation and other authors who decide to use it. You 32can use it too, but we suggest you first think carefully about whether 33this license or the ordinary General Public License is the better 34strategy to use in any particular case, based on the explanations below. 35 36 When we speak of free software, we are referring to freedom of use, 37not price. Our General Public Licenses are designed to make sure that 38you have the freedom to distribute copies of free software (and charge 39for this service if you wish); that you receive source code or can get 40it if you want it; that you can change the software and use pieces of 41it in new free programs; and that you are informed that you can do 42these things. 43 44 To protect your rights, we need to make restrictions that forbid 45distributors to deny you these rights or to ask you to surrender these 46rights. These restrictions translate to certain responsibilities for 47you if you distribute copies of the library or if you modify it. 48 49 For example, if you distribute copies of the library, whether gratis 50or for a fee, you must give the recipients all the rights that we gave 51you. You must make sure that they, too, receive or can get the source 52code. If you link other code with the library, you must provide 53complete object files to the recipients, so that they can relink them 54with the library after making changes to the library and recompiling 55it. And you must show them these terms so they know their rights. 56 57 We protect your rights with a two-step method: (1) we copyright the 58library, and (2) we offer you this license, which gives you legal 59permission to copy, distribute and/or modify the library. 60 61 To protect each distributor, we want to make it very clear that 62there is no warranty for the free library. Also, if the library is 63modified by someone else and passed on, the recipients should know 64that what they have is not the original version, so that the original 65author's reputation will not be affected by problems that might be 66introduced by others. 67 68 Finally, software patents pose a constant threat to the existence of 69any free program. We wish to make sure that a company cannot 70effectively restrict the users of a free program by obtaining a 71restrictive license from a patent holder. Therefore, we insist that 72any patent license obtained for a version of the library must be 73consistent with the full freedom of use specified in this license. 74 75 Most GNU software, including some libraries, is covered by the 76ordinary GNU General Public License. This license, the GNU Lesser 77General Public License, applies to certain designated libraries, and 78is quite different from the ordinary General Public License. We use 79this license for certain libraries in order to permit linking those 80libraries into non-free programs. 81 82 When a program is linked with a library, whether statically or using 83a shared library, the combination of the two is legally speaking a 84combined work, a derivative of the original library. The ordinary 85General Public License therefore permits such linking only if the 86entire combination fits its criteria of freedom. The Lesser General 87Public License permits more lax criteria for linking other code with 88the library. 89 90 We call this license the "Lesser" General Public License because it 91does Less to protect the user's freedom than the ordinary General 92Public License. It also provides other free software developers Less 93of an advantage over competing non-free programs. These disadvantages 94are the reason we use the ordinary General Public License for many 95libraries. However, the Lesser license provides advantages in certain 96special circumstances. 97 98 For example, on rare occasions, there may be a special need to 99encourage the widest possible use of a certain library, so that it becomes 100a de-facto standard. To achieve this, non-free programs must be 101allowed to use the library. A more frequent case is that a free 102library does the same job as widely used non-free libraries. In this 103case, there is little to gain by limiting the free library to free 104software only, so we use the Lesser General Public License. 105 106 In other cases, permission to use a particular library in non-free 107programs enables a greater number of people to use a large body of 108free software. For example, permission to use the GNU C Library in 109non-free programs enables many more people to use the whole GNU 110operating system, as well as its variant, the GNU/Linux operating 111system. 112 113 Although the Lesser General Public License is Less protective of the 114users' freedom, it does ensure that the user of a program that is 115linked with the Library has the freedom and the wherewithal to run 116that program using a modified version of the Library. 117 118 The precise terms and conditions for copying, distribution and 119modification follow. Pay close attention to the difference between a 120"work based on the library" and a "work that uses the library". The 121former contains code derived from the library, whereas the latter must 122be combined with the library in order to run. 123 124 GNU LESSER GENERAL PUBLIC LICENSE 125 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 126 127 0. This License Agreement applies to any software library or other 128program which contains a notice placed by the copyright holder or 129other authorized party saying it may be distributed under the terms of 130this Lesser General Public License (also called "this License"). 131Each licensee is addressed as "you". 132 133 A "library" means a collection of software functions and/or data 134prepared so as to be conveniently linked with application programs 135(which use some of those functions and data) to form executables. 136 137 The "Library", below, refers to any such software library or work 138which has been distributed under these terms. A "work based on the 139Library" means either the Library or any derivative work under 140copyright law: that is to say, a work containing the Library or a 141portion of it, either verbatim or with modifications and/or translated 142straightforwardly into another language. (Hereinafter, translation is 143included without limitation in the term "modification".) 144 145 "Source code" for a work means the preferred form of the work for 146making modifications to it. For a library, complete source code means 147all the source code for all modules it contains, plus any associated 148interface definition files, plus the scripts used to control compilation 149and installation of the library. 150 151 Activities other than copying, distribution and modification are not 152covered by this License; they are outside its scope. The act of 153running a program using the Library is not restricted, and output from 154such a program is covered only if its contents constitute a work based 155on the Library (independent of the use of the Library in a tool for 156writing it). Whether that is true depends on what the Library does 157and what the program that uses the Library does. 158 159 1. You may copy and distribute verbatim copies of the Library's 160complete source code as you receive it, in any medium, provided that 161you conspicuously and appropriately publish on each copy an 162appropriate copyright notice and disclaimer of warranty; keep intact 163all the notices that refer to this License and to the absence of any 164warranty; and distribute a copy of this License along with the 165Library. 166 167 You may charge a fee for the physical act of transferring a copy, 168and you may at your option offer warranty protection in exchange for a 169fee. 170 171 2. You may modify your copy or copies of the Library or any portion 172of it, thus forming a work based on the Library, and copy and 173distribute such modifications or work under the terms of Section 1 174above, provided that you also meet all of these conditions: 175 176 a) The modified work must itself be a software library. 177 178 b) You must cause the files modified to carry prominent notices 179 stating that you changed the files and the date of any change. 180 181 c) You must cause the whole of the work to be licensed at no 182 charge to all third parties under the terms of this License. 183 184 d) If a facility in the modified Library refers to a function or a 185 table of data to be supplied by an application program that uses 186 the facility, other than as an argument passed when the facility 187 is invoked, then you must make a good faith effort to ensure that, 188 in the event an application does not supply such function or 189 table, the facility still operates, and performs whatever part of 190 its purpose remains meaningful. 191 192 (For example, a function in a library to compute square roots has 193 a purpose that is entirely well-defined independent of the 194 application. Therefore, Subsection 2d requires that any 195 application-supplied function or table used by this function must 196 be optional: if the application does not supply it, the square 197 root function must still compute square roots.) 198 199These requirements apply to the modified work as a whole. If 200identifiable sections of that work are not derived from the Library, 201and can be reasonably considered independent and separate works in 202themselves, then this License, and its terms, do not apply to those 203sections when you distribute them as separate works. But when you 204distribute the same sections as part of a whole which is a work based 205on the Library, the distribution of the whole must be on the terms of 206this License, whose permissions for other licensees extend to the 207entire whole, and thus to each and every part regardless of who wrote 208it. 209 210Thus, it is not the intent of this section to claim rights or contest 211your rights to work written entirely by you; rather, the intent is to 212exercise the right to control the distribution of derivative or 213collective works based on the Library. 214 215In addition, mere aggregation of another work not based on the Library 216with the Library (or with a work based on the Library) on a volume of 217a storage or distribution medium does not bring the other work under 218the scope of this License. 219 220 3. You may opt to apply the terms of the ordinary GNU General Public 221License instead of this License to a given copy of the Library. To do 222this, you must alter all the notices that refer to this License, so 223that they refer to the ordinary GNU General Public License, version 2, 224instead of to this License. (If a newer version than version 2 of the 225ordinary GNU General Public License has appeared, then you can specify 226that version instead if you wish.) Do not make any other change in 227these notices. 228 229 Once this change is made in a given copy, it is irreversible for 230that copy, so the ordinary GNU General Public License applies to all 231subsequent copies and derivative works made from that copy. 232 233 This option is useful when you wish to copy part of the code of 234the Library into a program that is not a library. 235 236 4. You may copy and distribute the Library (or a portion or 237derivative of it, under Section 2) in object code or executable form 238under the terms of Sections 1 and 2 above provided that you accompany 239it with the complete corresponding machine-readable source code, which 240must be distributed under the terms of Sections 1 and 2 above on a 241medium customarily used for software interchange. 242 243 If distribution of object code is made by offering access to copy 244from a designated place, then offering equivalent access to copy the 245source code from the same place satisfies the requirement to 246distribute the source code, even though third parties are not 247compelled to copy the source along with the object code. 248 249 5. A program that contains no derivative of any portion of the 250Library, but is designed to work with the Library by being compiled or 251linked with it, is called a "work that uses the Library". Such a 252work, in isolation, is not a derivative work of the Library, and 253therefore falls outside the scope of this License. 254 255 However, linking a "work that uses the Library" with the Library 256creates an executable that is a derivative of the Library (because it 257contains portions of the Library), rather than a "work that uses the 258library". The executable is therefore covered by this License. 259Section 6 states terms for distribution of such executables. 260 261 When a "work that uses the Library" uses material from a header file 262that is part of the Library, the object code for the work may be a 263derivative work of the Library even though the source code is not. 264Whether this is true is especially significant if the work can be 265linked without the Library, or if the work is itself a library. The 266threshold for this to be true is not precisely defined by law. 267 268 If such an object file uses only numerical parameters, data 269structure layouts and accessors, and small macros and small inline 270functions (ten lines or less in length), then the use of the object 271file is unrestricted, regardless of whether it is legally a derivative 272work. (Executables containing this object code plus portions of the 273Library will still fall under Section 6.) 274 275 Otherwise, if the work is a derivative of the Library, you may 276distribute the object code for the work under the terms of Section 6. 277Any executables containing that work also fall under Section 6, 278whether or not they are linked directly with the Library itself. 279 280 6. As an exception to the Sections above, you may also combine or 281link a "work that uses the Library" with the Library to produce a 282work containing portions of the Library, and distribute that work 283under terms of your choice, provided that the terms permit 284modification of the work for the customer's own use and reverse 285engineering for debugging such modifications. 286 287 You must give prominent notice with each copy of the work that the 288Library is used in it and that the Library and its use are covered by 289this License. You must supply a copy of this License. If the work 290during execution displays copyright notices, you must include the 291copyright notice for the Library among them, as well as a reference 292directing the user to the copy of this License. Also, you must do one 293of these things: 294 295 a) Accompany the work with the complete corresponding 296 machine-readable source code for the Library including whatever 297 changes were used in the work (which must be distributed under 298 Sections 1 and 2 above); and, if the work is an executable linked 299 with the Library, with the complete machine-readable "work that 300 uses the Library", as object code and/or source code, so that the 301 user can modify the Library and then relink to produce a modified 302 executable containing the modified Library. (It is understood 303 that the user who changes the contents of definitions files in the 304 Library will not necessarily be able to recompile the application 305 to use the modified definitions.) 306 307 b) Use a suitable shared library mechanism for linking with the 308 Library. A suitable mechanism is one that (1) uses at run time a 309 copy of the library already present on the user's computer system, 310 rather than copying library functions into the executable, and (2) 311 will operate properly with a modified version of the library, if 312 the user installs one, as long as the modified version is 313 interface-compatible with the version that the work was made with. 314 315 c) Accompany the work with a written offer, valid for at 316 least three years, to give the same user the materials 317 specified in Subsection 6a, above, for a charge no more 318 than the cost of performing this distribution. 319 320 d) If distribution of the work is made by offering access to copy 321 from a designated place, offer equivalent access to copy the above 322 specified materials from the same place. 323 324 e) Verify that the user has already received a copy of these 325 materials or that you have already sent this user a copy. 326 327 For an executable, the required form of the "work that uses the 328Library" must include any data and utility programs needed for 329reproducing the executable from it. However, as a special exception, 330the materials to be distributed need not include anything that is 331normally distributed (in either source or binary form) with the major 332components (compiler, kernel, and so on) of the operating system on 333which the executable runs, unless that component itself accompanies 334the executable. 335 336 It may happen that this requirement contradicts the license 337restrictions of other proprietary libraries that do not normally 338accompany the operating system. Such a contradiction means you cannot 339use both them and the Library together in an executable that you 340distribute. 341 342 7. You may place library facilities that are a work based on the 343Library side-by-side in a single library together with other library 344facilities not covered by this License, and distribute such a combined 345library, provided that the separate distribution of the work based on 346the Library and of the other library facilities is otherwise 347permitted, and provided that you do these two things: 348 349 a) Accompany the combined library with a copy of the same work 350 based on the Library, uncombined with any other library 351 facilities. This must be distributed under the terms of the 352 Sections above. 353 354 b) Give prominent notice with the combined library of the fact 355 that part of it is a work based on the Library, and explaining 356 where to find the accompanying uncombined form of the same work. 357 358 8. You may not copy, modify, sublicense, link with, or distribute 359the Library except as expressly provided under this License. Any 360attempt otherwise to copy, modify, sublicense, link with, or 361distribute the Library is void, and will automatically terminate your 362rights under this License. However, parties who have received copies, 363or rights, from you under this License will not have their licenses 364terminated so long as such parties remain in full compliance. 365 366 9. You are not required to accept this License, since you have not 367signed it. However, nothing else grants you permission to modify or 368distribute the Library or its derivative works. These actions are 369prohibited by law if you do not accept this License. Therefore, by 370modifying or distributing the Library (or any work based on the 371Library), you indicate your acceptance of this License to do so, and 372all its terms and conditions for copying, distributing or modifying 373the Library or works based on it. 374 375 10. Each time you redistribute the Library (or any work based on the 376Library), the recipient automatically receives a license from the 377original licensor to copy, distribute, link with or modify the Library 378subject to these terms and conditions. You may not impose any further 379restrictions on the recipients' exercise of the rights granted herein. 380You are not responsible for enforcing compliance by third parties with 381this License. 382 383 11. If, as a consequence of a court judgment or allegation of patent 384infringement or for any other reason (not limited to patent issues), 385conditions are imposed on you (whether by court order, agreement or 386otherwise) that contradict the conditions of this License, they do not 387excuse you from the conditions of this License. If you cannot 388distribute so as to satisfy simultaneously your obligations under this 389License and any other pertinent obligations, then as a consequence you 390may not distribute the Library at all. For example, if a patent 391license would not permit royalty-free redistribution of the Library by 392all those who receive copies directly or indirectly through you, then 393the only way you could satisfy both it and this License would be to 394refrain entirely from distribution of the Library. 395 396If any portion of this section is held invalid or unenforceable under any 397particular circumstance, the balance of the section is intended to apply, 398and the section as a whole is intended to apply in other circumstances. 399 400It is not the purpose of this section to induce you to infringe any 401patents or other property right claims or to contest validity of any 402such claims; this section has the sole purpose of protecting the 403integrity of the free software distribution system which is 404implemented by public license practices. Many people have made 405generous contributions to the wide range of software distributed 406through that system in reliance on consistent application of that 407system; it is up to the author/donor to decide if he or she is willing 408to distribute software through any other system and a licensee cannot 409impose that choice. 410 411This section is intended to make thoroughly clear what is believed to 412be a consequence of the rest of this License. 413 414 12. If the distribution and/or use of the Library is restricted in 415certain countries either by patents or by copyrighted interfaces, the 416original copyright holder who places the Library under this License may add 417an explicit geographical distribution limitation excluding those countries, 418so that distribution is permitted only in or among countries not thus 419excluded. In such case, this License incorporates the limitation as if 420written in the body of this License. 421 422 13. The Free Software Foundation may publish revised and/or new 423versions of the Lesser General Public License from time to time. 424Such new versions will be similar in spirit to the present version, 425but may differ in detail to address new problems or concerns. 426 427Each version is given a distinguishing version number. If the Library 428specifies a version number of this License which applies to it and 429"any later version", you have the option of following the terms and 430conditions either of that version or of any later version published by 431the Free Software Foundation. If the Library does not specify a 432license version number, you may choose any version ever published by 433the Free Software Foundation. 434 435 14. If you wish to incorporate parts of the Library into other free 436programs whose distribution conditions are incompatible with these, 437write to the author to ask for permission. For software which is 438copyrighted by the Free Software Foundation, write to the Free 439Software Foundation; we sometimes make exceptions for this. Our 440decision will be guided by the two goals of preserving the free status 441of all derivatives of our free software and of promoting the sharing 442and reuse of software generally. 443 444 NO WARRANTY 445 446 15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO 447WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW. 448EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR 449OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY 450KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE 451IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 452PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE 453LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME 454THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 455 456 16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN 457WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY 458AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU 459FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR 460CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE 461LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING 462RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A 463FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF 464SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 465DAMAGES. 466 467 END OF TERMS AND CONDITIONS 468