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GNU Lesser General Public LicenseVersion 2.1, February 1999Copyright (C) 1991, 1999 Free Software Foundation, Inc. 59 Temple Place, Suite330, Boston, MA 02111-1307 USA Everyone is permitted to copy and distributeverbatim copies of this license document, but changing it is not allowed.PreambleThe licenses for most software are designed to take away your freedom to shareand change it. By contrast, the GNU General Public Licenses are intended toguarantee your freedom to share and change free software--to make sure thesoftware is free for all its users.This license, the Lesser General Public License, applies to some speciallydesignated software packages--typically libraries--of the Free SoftwareFoundation and other authors who decide to use it. You can use it too, but wesuggest you first think carefully about whether this license or the ordinaryGeneral Public License is the better strategy to use in any particular case,based on the explanations below.When we speak of free software, we are referring to freedom of use, not price.Our General Public Licenses are designed to make sure that you have thefreedom to distribute copies of free software (and charge for this service ifyou wish); that you receive source code or can get it if you want it; that youcan change the software and use pieces of it in new free programs; and thatyou are informed that you can do these things.To protect your rights, we need to make restrictions that forbid distributorsto deny you these rights or to ask you to surrender these rights. Theserestrictions translate to certain responsibilities for you if you distributecopies of the library or if you modify it.For example, if you distribute copies of the library, whether gratis or for afee, you must give the recipients all the rights that we gave you. You mustmake sure that they, too, receive or can get the source code. If you linkother code with the library, you must provide complete object files to therecipients, so that they can relink them with the library after making changesto the library and recompiling it. And you must show them these terms so theyknow their rights.We protect your rights with a two-step method: (1) we copyright the library,and (2) we offer you this license, which gives you legal permission to copy,distribute and/or modify the library.To protect each distributor, we want to make it very clear that there is nowarranty for the free library. Also, if the library is modified by someoneelse and passed on, the recipients should know that what they have is not theoriginal version, so that the original author's reputation will not beaffected by problems that might be introduced by others.Finally, software patents pose a constant threat to the existence of any freeprogram. We wish to make sure that a company cannot effectively restrict theusers of a free program by obtaining a restrictive license from a patentholder. Therefore, we insist that any patent license obtained for a version ofthe library must be consistent with the full freedom of use specified in thislicense.Most GNU software, including some libraries, is covered by the ordinary GNUGeneral Public License. This license, the GNU Lesser General Public License,applies to certain designated libraries, and is quite different from theordinary General Public License. We use this license for certain libraries inorder to permit linking those libraries into non-free programs.When a program is linked with a library, whether statically or using a sharedlibrary, the combination of the two is legally speaking a combined work, aderivative of the original library. The ordinary General Public Licensetherefore permits such linking only if the entire combination fits itscriteria of freedom. The Lesser General Public License permits more laxcriteria for linking other code with the library.We call this license the "Lesser" General Public License because it does Lessto protect the user's freedom than the ordinary General Public License. Italso provides other free software developers Less of an advantage overcompeting non-free programs. These disadvantages are the reason we use theordinary General Public License for many libraries. However, the Lesserlicense provides advantages in certain special circumstances.For example, on rare occasions, there may be a special need to encourage thewidest possible use of a certain library, so that it becomes a de-factostandard. To achieve this, non-free programs must be allowed to use thelibrary. A more frequent case is that a free library does the same job aswidely used non-free libraries. In this case, there is little to gain bylimiting the free library to free software only, so we use the Lesser GeneralPublic License.In other cases, permission to use a particular library in non-free programsenables a greater number of people to use a large body of free software. Forexample, permission to use the GNU C Library in non-free programs enables manymore people to use the whole GNU operating system, as well as its variant, theGNU/Linux operating system.Although the Lesser General Public License is Less protective of the users'freedom, it does ensure that the user of a program that is linked with theLibrary has the freedom and the wherewithal to run that program using amodified version of the Library.The precise terms and conditions for copying, distribution and modificationfollow. Pay close attention to the difference between a "work based on thelibrary" and a "work that uses the library". The former contains code derivedfrom the library, whereas the latter must be combined with the library inorder to run.TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION0. This License Agreement applies to any software library or other programwhich contains a notice placed by the copyright holder or other authorizedparty saying it may be distributed under the terms of this Lesser GeneralPublic License (also called "this License"). Each licensee is addressed as"you".A "library" means a collection of software functions and/or data prepared soas to be conveniently linked with application programs (which use some ofthose functions and data) to form executables.The "Library", below, refers to any such software library or work which hasbeen distributed under these terms. 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To do this, you mustalter all the notices that refer to this License, so that they refer to theordinary GNU General Public License, version 2, instead of to this License.(If a newer version than version 2 of the ordinary GNU General Public Licensehas appeared, then you can specify that version instead if you wish.) Do notmake any other change in these notices.Once this change is made in a given copy, it is irreversible for that copy, sothe ordinary GNU General Public License applies to all subsequent copies andderivative works made from that copy.This option is useful when you wish to copy part of the code of the Libraryinto 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 Sections1 and 2 above provided that you accompany it with the complete correspondingmachine-readable source code, which must be distributed under the terms of

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