| GNU LIBRARY GENERAL PUBLIC LICENSE |
| |
| Version 2, June 1991 Copyright (C) 1991 Free Software Foundation, Inc. |
| |
| 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA |
| |
| Everyone is permitted to copy and distribute verbatim copies of this license |
| document, but changing it is not allowed. |
| |
| [This is the first released version of the library GPL. It is numbered 2 because |
| it goes with version 2 of the ordinary GPL.] |
| |
| Preamble |
| |
| The licenses for most software are designed to take away your freedom to share |
| and change it. By contrast, the GNU General Public Licenses are intended to |
| guarantee your freedom to share and change free software--to make sure the |
| software is free for all its users. |
| |
| This license, the Library General Public License, applies to some specially |
| designated Free Software Foundation software, and to any other libraries whose |
| authors decide to use it. You can use it for your libraries, too. |
| |
| When we speak of free software, we are referring to freedom, not price. Our |
| General Public Licenses are designed to make sure that you have the freedom |
| to distribute copies of free software (and charge for this service if you |
| wish), that you receive source code or can get it if you want it, that you |
| can change the software or use pieces of it in new free programs; and that |
| you know you can do these things. |
| |
| To protect your rights, we need to make restrictions that forbid anyone to |
| deny you these rights or to ask you to surrender the rights. These restrictions |
| translate to certain responsibilities for you if you distribute copies of |
| the library, or if you modify it. |
| |
| For example, if you distribute copies of the library, whether gratis or for |
| a fee, you must give the recipients all the rights that we gave you. You must |
| make sure that they, too, receive or can get the source code. If you link |
| a program with the library, you must provide complete object files to the |
| recipients so that they can relink them with the library, after making changes |
| to the library and recompiling it. And you must show them these terms so they |
| know their rights. |
| |
| Our method of protecting your rights has two steps: (1) copyright the library, |
| and (2) offer you this license which gives you legal permission to copy, distribute |
| and/or modify the library. |
| |
| Also, for each distributor's protection, we want to make certain that everyone |
| understands that there is no warranty for this free library. If the library |
| is modified by someone else and passed on, we want its recipients to know |
| that what they have is not the original version, so that any problems introduced |
| by others will not reflect on the original authors' reputations. |
| |
| Finally, any free program is threatened constantly by software patents. We |
| wish to avoid the danger that companies distributing free software will individually |
| obtain patent licenses, thus in effect transforming the program into proprietary |
| software. To prevent this, we have made it clear that any patent must be licensed |
| for everyone's free use or not licensed at all. |
| |
| Most GNU software, including some libraries, is covered by the ordinary GNU |
| General Public License, which was designed for utility programs. This license, |
| the GNU Library General Public License, applies to certain designated libraries. |
| This license is quite different from the ordinary one; be sure to read it |
| in full, and don't assume that anything in it is the same as in the ordinary |
| license. |
| |
| The reason we have a separate public license for some libraries is that they |
| blur the distinction we usually make between modifying or adding to a program |
| and simply using it. Linking a program with a library, without changing the |
| library, is in some sense simply using the library, and is analogous to running |
| a utility program or application program. However, in a textual and legal |
| sense, the linked executable is a combined work, a derivative of the original |
| library, and the ordinary General Public License treats it as such. |
| |
| Because of this blurred distinction, using the ordinary General Public License |
| for libraries did not effectively promote software sharing, because most developers |
| did not use the libraries. We concluded that weaker conditions might promote |
| sharing better. |
| |
| However, unrestricted linking of non-free programs would deprive the users |
| of those programs of all benefit from the free status of the libraries themselves. |
| This Library General Public License is intended to permit developers of non-free |
| programs to use free libraries, while preserving your freedom as a user of |
| such programs to change the free libraries that are incorporated in them. |
| (We have not seen how to achieve this as regards changes in header files, |
| but we have achieved it as regards changes in the actual functions of the |
| Library.) The hope is that this will lead to faster development of free libraries. |
| |
| The precise terms and conditions for copying, distribution and modification |
| follow. Pay close attention to the difference between a "work based on the |
| library" and a "work that uses the library". The former contains code derived |
| from the library, while the latter only works together with the library. |
| |
| Note that it is possible for a library to be covered by the ordinary General |
| Public License rather than by this special one. |
| |
| TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION |
| |
| 0. This License Agreement applies to any software library which contains a |
| notice placed by the copyright holder or other authorized party saying it |
| may be distributed under the terms of this Library General Public License |
| (also called "this License"). Each licensee is addressed as "you". |
| |
| A "library" means a collection of software functions and/or data prepared |
| so as to be conveniently linked with application programs (which use some |
| of those functions and data) to form executables. |
| |
| The "Library", below, refers to any such software library or work which has |
| been distributed under these terms. A "work based on the Library" means either |
| the Library or any derivative work under copyright law: that is to say, a |
| work containing the Library or a portion of it, either verbatim or with modifications |
| and/or translated straightforwardly into another language. (Hereinafter, translation |
| is included without limitation in the term "modification".) |
| |
| "Source code" for a work means the preferred form of the work for making modifications |
| to it. For a library, complete source code means all the source code for all |
| modules it contains, plus any associated interface definition files, plus |
| the scripts used to control compilation and installation of the library. |
| |
| Activities other than copying, distribution and modification are not covered |
| by this License; they are outside its scope. The act of running a program |
| using the Library is not restricted, and output from such a program is covered |
| only if its contents constitute a work based on the Library (independent of |
| the use of the Library in a tool for writing it). Whether that is true depends |
| on what the Library does and what the program that uses the Library does. |
| |
| 1. You may copy and distribute verbatim copies of the Library's complete source |
| code as you receive it, in any medium, provided that you conspicuously and |
| appropriately publish on each copy an appropriate copyright notice and disclaimer |
| of warranty; keep intact all the notices that refer to this License and to |
| the absence of any warranty; and distribute a copy of this License along with |
| the Library. |
| |
| You may charge a fee for the physical act of transferring a copy, and you |
| may at your option offer warranty protection in exchange for a fee. |
| |
| 2. You may modify your copy or copies of the Library or any portion of it, |
| thus forming a work based on the Library, and copy and distribute such modifications |
| or work under the terms of Section 1 above, provided that you also meet all |
| of these conditions: |
| |
| a) The modified work must itself be a software library. |
| |
| b) You must cause the files modified to carry prominent notices stating that |
| you changed the files and the date of any change. |
| |
| c) You must cause the whole of the work to be licensed at no charge to all |
| third parties under the terms of this License. |
| |
| d) If a facility in the modified Library refers to a function or a table of |
| data to be supplied by an application program that uses the facility, other |
| than as an argument passed when the facility is invoked, then you must make |
| a good faith effort to ensure that, in the event an application does not supply |
| such function or table, the facility still operates, and performs whatever |
| part of its purpose remains meaningful. |
| |
| (For example, a function in a library to compute square roots has a purpose |
| that is entirely well-defined independent of the application. Therefore, Subsection |
| 2d requires that any application-supplied function or table used by this function |
| must be optional: if the application does not supply it, the square root function |
| must still compute square roots.) |
| |
| These requirements apply to the modified work as a whole. If identifiable |
| sections of that work are not derived from the Library, and can be reasonably |
| considered independent and separate works in themselves, then this License, |
| and its terms, do not apply to those sections when you distribute them as |
| separate works. But when you distribute the same sections as part of a whole |
| which is a work based on the Library, the distribution of the whole must be |
| on the terms of this License, whose permissions for other licensees extend |
| to the entire whole, and thus to each and every part regardless of who wrote |
| it. |
| |
| Thus, it is not the intent of this section to claim rights or contest your |
| rights to work written entirely by you; rather, the intent is to exercise |
| the right to control the distribution of derivative or collective works based |
| on the Library. |
| |
| In addition, mere aggregation of another work not based on the Library with |
| the Library (or with a work based on the Library) on a volume of a storage |
| or distribution medium does not bring the other work under the scope of this |
| License. |
| |
| 3. You may opt to apply the terms of the ordinary GNU General Public License |
| instead of this License to a given copy of the Library. To do this, you must |
| alter all the notices that refer to this License, so that they refer to the |
| ordinary GNU General Public License, version 2, instead of to this License. |
| (If a newer version than version 2 of the ordinary GNU General Public License |
| has appeared, then you can specify that version instead if you wish.) Do not |
| make any other change in these notices. |
| |
| Once this change is made in a given copy, it is irreversible for that copy, |
| so the ordinary GNU General Public License applies to all subsequent copies |
| and derivative works made from that copy. |
| |
| This option is useful when you wish to copy part of the code of the Library |
| into a program that is not a library. |
| |
| 4. You may copy and distribute the Library (or a portion or derivative of |
| it, under Section 2) in object code or executable form under the terms of |
| Sections 1 and 2 above provided that you accompany it with the complete corresponding |
| machine-readable source code, which must be distributed under the terms of |
| Sections 1 and 2 above on a medium customarily used for software interchange. |
| |
| If distribution of object code is made by offering access to copy from a designated |
| place, then offering equivalent access to copy the source code from the same |
| place satisfies the requirement to distribute the source code, even though |
| third parties are not compelled to copy the source along with the object code. |
| |
| 5. A program that contains no derivative of any portion of the Library, but |
| is designed to work with the Library by being compiled or linked with it, |
| is called a "work that uses the Library". Such a work, in isolation, is not |
| a derivative work of the Library, and therefore falls outside the scope of |
| this License. |
| |
| However, linking a "work that uses the Library" with the Library creates an |
| executable that is a derivative of the Library (because it contains portions |
| of the Library), rather than a "work that uses the library". The executable |
| is therefore covered by this License. Section 6 states terms for distribution |
| of such executables. |
| |
| When a "work that uses the Library" uses material from a header file that |
| is part of the Library, the object code for the work may be a derivative work |
| of the Library even though the source code is not. Whether this is true is |
| especially significant if the work can be linked without the Library, or if |
| the work is itself a library. The threshold for this to be true is not precisely |
| defined by law. |
| |
| If such an object file uses only numerical parameters, data structure layouts |
| and accessors, and small macros and small inline functions (ten lines or less |
| in length), then the use of the object file is unrestricted, regardless of |
| whether it is legally a derivative work. (Executables containing this object |
| code plus portions of the Library will still fall under Section 6.) |
| |
| Otherwise, if the work is a derivative of the Library, you may distribute |
| the object code for the work under the terms of Section 6. Any executables |
| containing that work also fall under Section 6, whether or not they are linked |
| directly with the Library itself. |
| |
| 6. As an exception to the Sections above, you may also compile or link a "work |
| that uses the Library" with the Library to produce a work containing portions |
| of the Library, and distribute that work under terms of your choice, provided |
| that the terms permit modification of the work for the customer's own use |
| and reverse engineering for debugging such modifications. |
| |
| You must give prominent notice with each copy of the work that the Library |
| is used in it and that the Library and its use are covered by this License. |
| You must supply a copy of this License. If the work during execution displays |
| copyright notices, you must include the copyright notice for the Library among |
| them, as well as a reference directing the user to the copy of this License. |
| Also, you must do one of these things: |
| |
| a) Accompany the work with the complete corresponding machine-readable source |
| code for the Library including whatever changes were used in the work (which |
| must be distributed under Sections 1 and 2 above); and, if the work is an |
| executable linked with the Library, with the complete machine-readable "work |
| that uses the Library", as object code and/or source code, so that the user |
| can modify the Library and then relink to produce a modified executable containing |
| the modified Library. (It is understood that the user who changes the contents |
| of definitions files in the Library will not necessarily be able to recompile |
| the application to use the modified definitions.) |
| |
| b) Accompany the work with a written offer, valid for at least three years, |
| to give the same user the materials specified in Subsection 6a, above, for |
| a charge no more than the cost of performing this distribution. |
| |
| c) If distribution of the work is made by offering access to copy from a designated |
| place, offer equivalent access to copy the above specified materials from |
| the same place. |
| |
| d) Verify that the user has already received a copy of these materials or |
| that you have already sent this user a copy. |
| |
| For an executable, the required form of the "work that uses the Library" must |
| include any data and utility programs needed for reproducing the executable |
| from it. However, as a special exception, the source code distributed need |
| not include anything that is normally distributed (in either source or binary |
| form) with the major components (compiler, kernel, and so on) of the operating |
| system on which the executable runs, unless that component itself accompanies |
| the executable. |
| |
| It may happen that this requirement contradicts the license restrictions of |
| other proprietary libraries that do not normally accompany the operating system. |
| Such a contradiction means you cannot use both them and the Library together |
| in an executable that you distribute. |
| |
| 7. You may place library facilities that are a work based on the Library side-by-side |
| in a single library together with other library facilities not covered by |
| this License, and distribute such a combined library, provided that the separate |
| distribution of the work based on the Library and of the other library facilities |
| is otherwise permitted, and provided that you do these two things: |
| |
| a) Accompany the combined library with a copy of the same work based on the |
| Library, uncombined with any other library facilities. This must be distributed |
| under the terms of the Sections above. |
| |
| b) Give prominent notice with the combined library of the fact that part of |
| it is a work based on the Library, and explaining where to find the accompanying |
| uncombined form of the same work. |
| |
| 8. You may not copy, modify, sublicense, link with, or distribute the Library |
| except as expressly provided under this License. Any attempt otherwise to |
| copy, modify, sublicense, link with, or distribute the Library is void, and |
| will automatically terminate your rights under this License. However, parties |
| who have received copies, or rights, from you under this License will not |
| have their licenses terminated so long as such parties remain in full compliance. |
| |
| 9. You are not required to accept this License, since you have not signed |
| it. However, nothing else grants you permission to modify or distribute the |
| Library or its derivative works. These actions are prohibited by law if you |
| do not accept this License. Therefore, by modifying or distributing the Library |
| (or any work based on the Library), you indicate your acceptance of this License |
| to do so, and all its terms and conditions for copying, distributing or modifying |
| the Library or works based on it. |
| |
| 10. Each time you redistribute the Library (or any work based on the Library), |
| the recipient automatically receives a license from the original licensor |
| to copy, distribute, link with or modify the Library subject to these terms |
| and conditions. You may not impose any further restrictions on the recipients' |
| exercise of the rights granted herein. You are not responsible for enforcing |
| compliance by third parties to this License. |
| |
| 11. If, as a consequence of a court judgment or allegation of patent infringement |
| or for any other reason (not limited to patent issues), conditions are imposed |
| on you (whether by court order, agreement or otherwise) that contradict the |
| conditions of this License, they do not excuse you from the conditions of |
| this License. If you cannot distribute so as to satisfy simultaneously your |
| obligations under this License and any other pertinent obligations, then as |
| a consequence you may not distribute the Library at all. For example, if a |
| patent license would not permit royalty-free redistribution of the Library |
| by all those who receive copies directly or indirectly through you, then the |
| only way you could satisfy both it and this License would be to refrain entirely |
| from distribution of the Library. |
| |
| If any portion of this section is held invalid or unenforceable under any |
| particular circumstance, the balance of the section is intended to apply, |
| and the section as a whole is intended to apply in other circumstances. |
| |
| It is not the purpose of this section to induce you to infringe any patents |
| or other property right claims or to contest validity of any such claims; |
| this section has the sole purpose of protecting the integrity of the free |
| software distribution system which is implemented by public license practices. |
| Many people have made generous contributions to the wide range of software |
| distributed through that system in reliance on consistent application of that |
| system; it is up to the author/donor to decide if he or she is willing to |
| distribute software through any other system and a licensee cannot impose |
| that choice. |
| |
| This section is intended to make thoroughly clear what is believed to be a |
| consequence of the rest of this License. |
| |
| 12. If the distribution and/or use of the Library is restricted in certain |
| countries either by patents or by copyrighted interfaces, the original copyright |
| holder who places the Library under this License may add an explicit geographical |
| distribution limitation excluding those countries, so that distribution is |
| permitted only in or among countries not thus excluded. In such case, this |
| License incorporates the limitation as if written in the body of this License. |
| |
| 13. The Free Software Foundation may publish revised and/or new versions of |
| the Library General Public License from time to time. Such new versions will |
| be similar in spirit to the present version, but may differ in detail to address |
| new problems or concerns. |
| |
| Each version is given a distinguishing version number. If the Library specifies |
| a version number of this License which applies to it and "any later version", |
| you have the option of following the terms and conditions either of that version |
| or of any later version published by the Free Software Foundation. If the |
| Library does not specify a license version number, you may choose any version |
| ever published by the Free Software Foundation. |
| |
| 14. If you wish to incorporate parts of the Library into other free programs |
| whose distribution conditions are incompatible with these, write to the author |
| to ask for permission. For software which is copyrighted by the Free Software |
| Foundation, write to the Free Software Foundation; we sometimes make exceptions |
| for this. Our decision will be guided by the two goals of preserving the free |
| status of all derivatives of our free software and of promoting the sharing |
| and reuse of software generally. |
| |
| NO WARRANTY |
| |
| 15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR |
| THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE |
| STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE LIBRARY |
| "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, |
| BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE |
| OF THE LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME |
| THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. |
| |
| 16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING |
| WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE |
| THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY |
| GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE |
| OR INABILITY TO USE THE LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA |
| OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES |
| OR A FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF SUCH |
| HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. |
| END OF TERMS AND CONDITIONS |
| |
| How to Apply These Terms to Your New Libraries |
| |
| If you develop a new library, and you want it to be of the greatest possible |
| use to the public, we recommend making it free software that everyone can |
| redistribute and change. You can do so by permitting redistribution under |
| these terms (or, alternatively, under the terms of the ordinary General Public |
| License). |
| |
| To apply these terms, attach the following notices to the library. It is safest |
| to attach them to the start of each source file to most effectively convey |
| the exclusion of warranty; and each file should have at least the "copyright" |
| line and a pointer to where the full notice is found. |
| |
| one line to give the library's name and an idea of what it does. |
| |
| Copyright (C) year name of author |
| |
| This library is free software; you can redistribute it and/or modify it under |
| the terms of the GNU Library General Public License as published by the Free |
| Software Foundation; either version 2 of the License, or (at your option) |
| any later version. |
| |
| This library is distributed in the hope that it will be useful, but WITHOUT |
| ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
| FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more |
| details. |
| |
| You should have received a copy of the GNU Library General Public License |
| along with this library; if not, write to the Free Software Foundation, Inc., |
| 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. |
| |
| Also add information on how to contact you by electronic and paper mail. |
| |
| You should also get your employer (if you work as a programmer) or your school, |
| if any, to sign a "copyright disclaimer" for the library, if necessary. Here |
| is a sample; alter the names: |
| |
| Yoyodyne, Inc., hereby disclaims all copyright interest in |
| |
| the library `Frob' (a library for tweaking knobs) written |
| |
| by James Random Hacker. |
| |
| signature of Ty Coon, 1 April 1990 |
| |
| Ty Coon, President of Vice |
| |
| That's all there is to it! |