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GNU LESSER GENERAL PUBLIC LICENSE |
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Version 3, 29 June 2007 |
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GNU LIBRARY GENERAL PUBLIC LICENSE |
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Version 2, June 1991 |
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Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/> |
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Copyright (C) 1991 Free Software Foundation, Inc. |
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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Everyone is permitted to copy and distribute verbatim copies |
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of this license document, but changing it is not allowed. |
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This version of the GNU Lesser General Public License incorporates |
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the terms and conditions of version 3 of the GNU General Public |
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License, supplemented by the additional permissions listed below. |
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0. Additional Definitions. |
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As used herein, "this License" refers to version 3 of the GNU Lesser |
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General Public License, and the "GNU GPL" refers to version 3 of the GNU |
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General Public License. |
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"The Library" refers to a covered work governed by this License, |
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other than an Application or a Combined Work as defined below. |
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An "Application" is any work that makes use of an interface provided |
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by the Library, but which is not otherwise based on the Library. |
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Defining a subclass of a class defined by the Library is deemed a mode |
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of using an interface provided by the Library. |
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A "Combined Work" is a work produced by combining or linking an |
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Application with the Library. The particular version of the Library |
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with which the Combined Work was made is also called the "Linked |
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Version". |
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The "Minimal Corresponding Source" for a Combined Work means the |
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Corresponding Source for the Combined Work, excluding any source code |
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for portions of the Combined Work that, considered in isolation, are |
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based on the Application, and not on the Linked Version. |
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The "Corresponding Application Code" for a Combined Work means the |
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object code and/or source code for the Application, including any data |
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and utility programs needed for reproducing the Combined Work from the |
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Application, but excluding the System Libraries of the Combined Work. |
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1. Exception to Section 3 of the GNU GPL. |
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You may convey a covered work under sections 3 and 4 of this License |
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without being bound by section 3 of the GNU GPL. |
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2. Conveying Modified Versions. |
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If you modify a copy of the Library, and, in your modifications, a |
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facility refers to a function or data to be supplied by an Application |
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that uses the facility (other than as an argument passed when the |
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facility is invoked), then you may convey a copy of the modified |
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version: |
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a) under this License, provided that you make a good faith effort to |
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ensure that, in the event an Application does not supply the |
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function or data, the facility still operates, and performs |
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whatever part of its purpose remains meaningful, or |
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b) under the GNU GPL, with none of the additional permissions of |
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this License applicable to that copy. |
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3. Object Code Incorporating Material from Library Header Files. |
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The object code form of an Application may incorporate material from |
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a header file that is part of the Library. You may convey such object |
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code under terms of your choice, provided that, if the incorporated |
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material is not limited to numerical parameters, data structure |
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layouts and accessors, or small macros, inline functions and templates |
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(ten or fewer lines in length), you do both of the following: |
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a) Give prominent notice with each copy of the object code that the |
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Library is used in it and that the Library and its use are |
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covered by this License. |
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b) Accompany the object code with a copy of the GNU GPL and this license |
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document. |
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4. Combined Works. |
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You may convey a Combined Work under terms of your choice that, |
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taken together, effectively do not restrict modification of the |
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portions of the Library contained in the Combined Work and reverse |
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engineering for debugging such modifications, if you also do each of |
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the following: |
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a) Give prominent notice with each copy of the Combined Work that |
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the Library is used in it and that the Library and its use are |
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covered by this License. |
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b) Accompany the Combined Work with a copy of the GNU GPL and this license |
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document. |
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c) For a Combined Work that displays copyright notices during |
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execution, include the copyright notice for the Library among |
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these notices, as well as a reference directing the user to the |
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copies of the GNU GPL and this license document. |
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d) Do one of the following: |
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0) Convey the Minimal Corresponding Source under the terms of this |
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License, and the Corresponding Application Code in a form |
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suitable for, and under terms that permit, the user to |
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recombine or relink the Application with a modified version of |
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the Linked Version to produce a modified Combined Work, in the |
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manner specified by section 6 of the GNU GPL for conveying |
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Corresponding Source. |
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1) Use a suitable shared library mechanism for linking with the |
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Library. A suitable mechanism is one that (a) uses at run time |
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a copy of the Library already present on the user's computer |
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system, and (b) will operate properly with a modified version |
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of the Library that is interface-compatible with the Linked |
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Version. |
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e) Provide Installation Information, but only if you would otherwise |
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be required to provide such information under section 6 of the |
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GNU GPL, and only to the extent that such information is |
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necessary to install and execute a modified version of the |
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Combined Work produced by recombining or relinking the |
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Application with a modified version of the Linked Version. (If |
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you use option 4d0, the Installation Information must accompany |
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the Minimal Corresponding Source and Corresponding Application |
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Code. If you use option 4d1, you must provide the Installation |
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Information in the manner specified by section 6 of the GNU GPL |
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for conveying Corresponding Source.) |
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5. Combined Libraries. |
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You may place library facilities that are a work based on the |
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Library side by side in a single library together with other library |
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facilities that are not Applications and are not covered by this |
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License, and convey such a combined library under terms of your |
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choice, if you do both of the following: |
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a) Accompany the combined library with a copy of the same work based |
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on the Library, uncombined with any other library facilities, |
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conveyed under the terms of this License. |
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b) Give prominent notice with the combined library that part of it |
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is a work based on the Library, and explaining where to find the |
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accompanying uncombined form of the same work. |
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6. Revised Versions of the GNU Lesser General Public License. |
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The Free Software Foundation may publish revised and/or new versions |
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of the GNU Lesser General Public License from time to time. Such new |
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versions will be similar in spirit to the present version, but may |
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differ in detail to address new problems or concerns. |
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Each version is given a distinguishing version number. If the |
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Library as you received it specifies that a certain numbered version |
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of the GNU Lesser General Public License "or any later version" |
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applies to it, you have the option of following the terms and |
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conditions either of that published version or of any later version |
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published by the Free Software Foundation. If the Library as you |
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received it does not specify a version number of the GNU Lesser |
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General Public License, you may choose any version of the GNU Lesser |
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General Public License ever published by the Free Software Foundation. |
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If the Library as you received it specifies that a proxy can decide |
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whether future versions of the GNU Lesser General Public License shall |
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apply, that proxy's public statement of acceptance of any version is |
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permanent authorization for you to choose that version for the |
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[This is the first released version of the library GPL. It is |
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numbered 2 because it goes with version 2 of the ordinary GPL.] |
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Preamble |
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The licenses for most software are designed to take away your |
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freedom to share and change it. By contrast, the GNU General Public |
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Licenses are intended to guarantee your freedom to share and change |
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free software--to make sure the software is free for all its users. |
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This license, the Library General Public License, applies to some |
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specially designated Free Software Foundation software, and to any |
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other libraries whose authors decide to use it. You can use it for |
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your libraries, too. |
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When we speak of free software, we are referring to freedom, not |
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price. Our General Public Licenses are designed to make sure that you |
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have the freedom to distribute copies of free software (and charge for |
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this service if you wish), that you receive source code or can get it |
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if you want it, that you can change the software or use pieces of it |
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in new free programs; and that you know you can do these things. |
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To protect your rights, we need to make restrictions that forbid |
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anyone to deny you these rights or to ask you to surrender the rights. |
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These restrictions translate to certain responsibilities for you if |
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you distribute copies of the library, or if you modify it. |
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For example, if you distribute copies of the library, whether gratis |
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or for a fee, you must give the recipients all the rights that we gave |
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code. If you link a program with the library, you must provide |
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with the library, after making changes to the library and recompiling |
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it. And you must show them these terms so they know their rights. |
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Our method of protecting your rights has two steps: (1) copyright |
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the library, and (2) offer you this license which gives you legal |
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permission to copy, distribute and/or modify the library. |
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Also, for each distributor's protection, we want to make certain |
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that everyone understands that there is no warranty for this free |
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the original authors' reputations. |
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Finally, any free program is threatened constantly by software |
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patents. We wish to avoid the danger that companies distributing free |
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transforming the program into proprietary software. To prevent this, |
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we have made it clear that any patent must be licensed for everyone's |
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free use or not licensed at all. |
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Most GNU software, including some libraries, is covered by the ordinary |
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GNU General Public License, which was designed for utility programs. This |
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license, the GNU Library General Public License, applies to certain |
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designated libraries. This license is quite different from the ordinary |
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one; be sure to read it in full, and don't assume that anything in it is |
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the same as in the ordinary license. |
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The reason we have a separate public license for some libraries is that |
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they blur the distinction we usually make between modifying or adding to a |
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program and simply using it. Linking a program with a library, without |
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changing the library, is in some sense simply using the library, and is |
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analogous to running a utility program or application program. However, in |
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a textual and legal sense, the linked executable is a combined work, a |
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derivative of the original library, and the ordinary General Public License |
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treats it as such. |
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Because of this blurred distinction, using the ordinary General |
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Public License for libraries did not effectively promote software |
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sharing, because most developers did not use the libraries. We |
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concluded that weaker conditions might promote sharing better. |
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However, unrestricted linking of non-free programs would deprive the |
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users of those programs of all benefit from the free status of the |
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libraries themselves. This Library General Public License is intended to |
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permit developers of non-free programs to use free libraries, while |
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preserving your freedom as a user of such programs to change the free |
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libraries that are incorporated in them. (We have not seen how to achieve |
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this as regards changes in header files, but we have achieved it as regards |
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changes in the actual functions of the Library.) The hope is that this |
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will lead to faster development of free libraries. |
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The precise terms and conditions for copying, distribution and |
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modification follow. Pay close attention to the difference between a |
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"work based on the library" and a "work that uses the library". The |
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former contains code derived from the library, while the latter only |
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works together with the library. |
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Note that it is possible for a library to be covered by the ordinary |
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General Public License rather than by this special one. |
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GNU LIBRARY GENERAL PUBLIC LICENSE |
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TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION |
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0. This License Agreement applies to any software library which |
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contains a notice placed by the copyright holder or other authorized |
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party saying it may be distributed under the terms of this Library |
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General Public License (also called "this License"). Each licensee is |
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addressed as "you". |
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A "library" means a collection of software functions and/or data |
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prepared so as to be conveniently linked with application programs |
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(which use some of those functions and data) to form executables. |
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The "Library", below, refers to any such software library or work |
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which has been distributed under these terms. A "work based on the |
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Library" means either the Library or any derivative work under |
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copyright law: that is to say, a work containing the Library or a |
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portion of it, either verbatim or with modifications and/or translated |
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straightforwardly into another language. (Hereinafter, translation is |
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included without limitation in the term "modification".) |
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"Source code" for a work means the preferred form of the work for |
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making modifications to it. For a library, complete source code means |
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interface definition files, plus the scripts used to control compilation |
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and installation of the library. |
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Activities other than copying, distribution and modification are not |
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covered by this License; they are outside its scope. The act of |
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running a program using the Library is not restricted, and output from |
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such a program is covered only if its contents constitute a work based |
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on the Library (independent of the use of the Library in a tool for |
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writing it). Whether that is true depends on what the Library does |
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and what the program that uses the Library does. |
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1. You may copy and distribute verbatim copies of the Library's |
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complete source code as you receive it, in any medium, provided that |
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you conspicuously and appropriately publish on each copy an |
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appropriate copyright notice and disclaimer of warranty; keep intact |
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all the notices that refer to this License and to the absence of any |
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warranty; and distribute a copy of this License along with the |
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Library. |
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You may charge a fee for the physical act of transferring a copy, |
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and you may at your option offer warranty protection in exchange for a |
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fee. |
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2. You may modify your copy or copies of the Library or any portion |
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of it, thus forming a work based on the Library, and copy and |
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distribute such modifications or work under the terms of Section 1 |
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above, provided that you also meet all of these conditions: |
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a) The modified work must itself be a software library. |
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b) You must cause the files modified to carry prominent notices |
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stating that you changed the files and the date of any change. |
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c) You must cause the whole of the work to be licensed at no |
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charge to all third parties under the terms of this License. |
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d) If a facility in the modified Library refers to a function or a |
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table of data to be supplied by an application program that uses |
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the facility, other than as an argument passed when the facility |
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is invoked, then you must make a good faith effort to ensure that, |
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in the event an application does not supply such function or |
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table, the facility still operates, and performs whatever part of |
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its purpose remains meaningful. |
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(For example, a function in a library to compute square roots has |
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a purpose that is entirely well-defined independent of the |
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application. Therefore, Subsection 2d requires that any |
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