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GNU 较宽松公共许可证, 1999.2, 第 2.1 版 可以在开源软件或商业软件中免费使用本项目，但不可改变本项目的版权信息和销售本项目的任何修改版本。
只要您在每一程式副本上明显和恰当地宣告版权声明和不承担担保的声明，并保持此许可证的声明和没有担保的声明完整无损，并和程式一起给其他每位程式接受者一份许可证的副本，您就可以用任何媒体复制和发布您收到的函数库的完整原始码。
- 您可以为转让副本的实际行动收取一定费用。您也可以选择提供担保以换取一定的费用。
只要您同时满足下面的所有条件，您就可以按前面第一款的要求修改函数库的一个或几个副本或它的任何部分，以此形成基于此函数库的作品，并且复制和发布这一经过修改的程式或作品:
- 被修改的作品本身必须是一个软体函数库。
- 您必须在修改过的档案中附有明确的说明：您修改了此一档案及任何修改的日期。
- 您必须让整个作品允许第三方在此许可证条款下可以免费使用。
- 如果修改过的函数库其某个设备使用到了「使用本函数库的应用程式」所提供的函数或资料表格，却不是当此设备被调用时以参数列传入时，则您必须确实做到，当应用程式不提供这样的函数或表格时，则此设备依旧能工作，且其执行的任何目的仍然有意义。
- 这些要求适用于整个修改过的作品。如果能够确定作品的一部分并非本函数库的衍生产品，且可以合理地单独考虑并将它与原作品分开的话，则当您将它作为独立的作品发布时，它不受此许可证和其条款的约束。但是当您将这部分与基于本函数库的作品一同发布时，则整个套件将受到本许可证条款约束，其对于其他许可证持有人的使用范围扩大到整个产品，也就是套件的每个部分，不管它是谁写的。
因此，本条款的意图不在于索取权利，或剥夺完全由您完成的作品的权利，而是履行权利来控制基于本函数库的集体作品或衍生作品的发布。 此外，将与本函数库无关的作品和本函数库 (或基于本函数库的作品) 一起放在贮存媒体或发布媒体的同一卷上，并不导致将其他作品置于此许可证的约束范围之内。
对于一个函数库的副本，您可以选择性地使用原来的 GNU 通用公共许可证上的条款来取代本许可证上的条款。如果您要这么做，您必须修改所有的参考到本许可证的注意事项，使它们指向原来的 GNU 通用公共许可证，第二版，以取代本许可证(如果有比第二版的原来的 GNU 通用公共许可证更新的版本出现的话，则如果您愿意的话可以特别指明使用新版)。请不要对这些注意事项做出其他的改变。
- 一旦在一个副本上做了这样的改变，则该副本就无法撤回这样的改变，故原来的 GNU 通用公共许可证将适用于所有后续的副本以及由此副本衍生出来的作品。
- 此一选择性适用于当您想要将一部分的函数库原始码复制到一个非函数库的程式使用时。
您可以以目标码或可执行形式复制或发布本函数库 (或符合第 2 款，基于本函数库的作品)，只要您遵守前面的第 1、2 款，并同时提供完整的相关机器可读的原始码，而这些原始码必须在前面的第 1 与第 2 款条件下，在一般习惯上用来做软体交换的媒体上发布。
如果所发布的目标码是由指定的地点提供拷贝索取，那么由同一地点所提供等价的原始码拷贝索取可以算作原始码的发布，即使第三方不强求与目标码一起复制原始码。
一个程式若包含不经任何部分修改的函数库，但却是设计经由编译或连结的方式与本函数库一同工作者，称之为 "使用函数库的作品"。这样的一个作品，严格地说，并非本函数库的衍生作品，因而不在本许可证的范围之内。
然而，将 "使用函数库的作品" 与本函数库连结而产生可执行程式，则是本函数库的衍生品 (因为它包函了本函数库的一部分)，而不是 "使用函数库的作品"，因此其可执行程式包含在本许可证的范围内。第 6 款说明了发布此可执行程式的条款。
当 "使用函数库的作品" 使用了函数库部分的标头档内容时，则此作品即使其原始码不属于本函数库的衍生品，但其目标码仍然是。这一点是否为真特别在是否本作品可以在不需要本函数库即可连结，或者是否该作品本身也是一个函数库时特别明显。
如果这样的目标档只使用数字参数、资料结构层级与附属品、以及小巨集和小内□式 (小于或等于十行) ，则此目标档的使用是不受限的，不论是否它是合法的衍生作品。 (但可执行程式若包函此目标档以及一部分的函数库，仍然将在第 6 款的规定下)
否则的话，如果本作品是本函数库的衍生品，您必须在第 6 款的规定下发布该作品的目标码。任何包含该作品的可执行程式也在第 6 款的范围内，不论它们是否直接与本函数库连结。
做为上述条款的例外情况，您也可以将 "使用函数库的作品" 与本函数库结合或连结，以产生包含部分本函数库的作品，并在允许使用者自身使用时可以修改该作品，以及在对修改进行反组译除错的情况下，您可以依照您的选择发布该作品。
您必须在每个作品的副本突显出如下的注意事项：本函数库在作品中被使用，以及本函数库以及它的使用是在本许可证的规定下。您必须提供本许可证的副本。如果该作品在执行时显示版权声明，您必须在其中包含本函数库的版权声明，以及指引使用者取得本许可证的副本。同时，您必须做到以下其中一件事：
必须将完整的机器可读的函数库原始码包含在该作品中，包括任何该作品使用到的改变 (这些改变必须在前述第 1 与第 2 款的要求下发布)；而且，如果该作品是一个与函数库连结的「完整的、机器可□的 "使用函数库的作品"」，则要有目标码和/或原始码，如此使用者可以修改本函数库且可以重新连结，以产生包函修改过的函数库的修改过的可执行程式。 (理所当然的若使用者修改了函数库的档案定义内容时，则该作品不必然可以重新编译以使用修改过的定义。)
在与函数库连结时使用适当的分享函数库连结机制。一个适当的机制是： (1) 在执行时使用已存在于使用者的电脑中的函数库副本，而不是将函数库的函数复制到可执行程式里，以及 (2) 如果使用者安装了一份修改过的函数库，只要修改过的版本在介面上与该作品在编译连结时所用的版本是相容的，则该执行程式可以与修改过的函数库运作良好。
在该作品内提供书面报价，有效期不少于三年，以提供同样的使用者上述第 6a 款中的内容，费用不得超过该程式发布的实际成本。 如果所发布的作品是由指定的地点提供拷贝索取，则由同一地点提供上述内容的等价拷贝索取。
确定使用者已经收到该作品的一份复制，或是您已经寄给该使用者一份复制品。 对于一个可执行程式，其所需的 "使用函数库的作品" 的形式必须包括任何要从中再产生可执行程式时所需的资料与工具程式。然而，有一个特殊例外，其所发布的内容不需要包括任何一般与「可执行本程式的作业系统」的主要部分 (如编译器、核心等) 一起发布的部分 (不论是原始码或可执行码)，除非这些组成部分和可执行作品结合在一起。
有一个可能情况是，这些要求与其他通常不与作业系统在一起的私有函数库的版权限制相抵触，这样的抵触表示您不能将它们与本函数库一起用于您发布的可执行程式中。
您可以将使用本函数库的函数库设备，以及其他不在本许可证范围内的函数库，对等地放入一个单独的函数库中，并在基于本函数库的作品以及其他函数库在其他状态下同意可以个别发布，以及您做到以下两点的情况下，您可以发布此结合的函数库：
将基于本函数库的作品单独不与其他函数库设备结合地，与此结合的函数库一同发布。该作品必须在上述条款的规定下发布。
在此结合的函数库中明显地指出其中一部分的作品是基于本函数库，并且说明那里可以找到同样不具结合形式的作品。
除非您明确按许可证提出的要求去做，否则您不能复制、修改、转发许可证、与本函数库连结、和发布本函数库。任何试图用其他方式复制、修改、转发许可证、与本函数库连结、和发布本函数库是无效的，而且将自动结束许可证赋予您的权利。然而，对那些从您那里按许可证条款得到副本和权利的人们，只要他们继续全面履行条款，许可证赋予他们的权利仍然有效。
您没有在许可证上签字，因而您没有必要一定接受此一许可证。然而，没有任何其他东西赋予您修改和发布本函数库及其衍生作品的权利。如果您不接受许可证，这些行为是法律禁止的。因此，如果您修改或发布函数库 (或任何基于函数库的作品) ，您就表明您接受这一许可证以及它的所有有关复制、发布和修改本函数库或基于它的作品的条款和条件。
每当您重新发布函数库 (或任何基于函数库的作品) 时，接受者自动从原始许可证颁发者那里接到受这些条款和条件支配的复制、发布、连结或修改本函数库的许可。您不可以强迫接受者履行除了这里赋予他们的权利之外的其他限制。您也没有强求第三方履行许可证条款的义务。
如果由于法院判决或违反专利的指控或任何其他原因 (不限于专利问题) 的结果，使得强加于您的条件 (不管是法院判决，协议书或其他) 和许可证的条件有冲突时，他们也不能令您背离许可证的条款。在您不能同时满足本许可证规定的义务及其他相关的义务来发布函数库时，则结果您只能够根本不发布函数库。例如，如果某一专利许可证不允许所有直接或间接从您那里接受副本的人们，在不付专利费的情况下重新发布函数库，唯一能同时满足两方面要求的办法是停止发布函数库。
如果本条款的任何部分在特定的环境下无效或无法实施，就使用条款的其余部分，并将这部分条款作为整体用于其他环境。 本条款的目的不在于引诱您侵犯专利或其他财产权的要求，或争论这种要求的有效性。本条款的主要目的在于保护自由软体发布系统的完整性。它是通过公共许可证的应用来实现的。许多人已依赖同是出自此系统的应用程式，经由此系统发布大量自由软体而做出慷慨的供献。作者/捐献者有权决定他/她是否通过任何其他系统发布软体，许可证持有人不能强加这种选择。
如果由于专利或者由于有版权的介面问题使函数库在某些国家的发布和使用受到限制，则在许可证约束下的原始版权拥有者可以增加发布地区的限制条款，将这些国家明确排除在外，并在这些国家以外的地区发布函数库。在这种情况下，许可证套件含的限制条款和许可证正文一样有效。 13. 自由软体基金会可能随时出版较宽松通用公共许可证的修改版或新版。新版和当前的版本在原则上保持一致，但在提到新问题时或有关事项时，在细节上可能出现差别。
每一版本都有不同的版本号。如果函数库指定可适用的许可证版本号以及 "任何更新的版本" ，您有权选择遵循指定的版本或自由软体基金会以后出版的新版本。如果函数库未指定许可证版本，您可选择自由软体基金会已经出版的任何版本。 14. 如果您愿意将函数库的一部分结合到其他自由程式中，而它们的发布条件不同，请写信给作者，要求准予使用。如果是自由软体基金会加以版权保护的软体，写信给自由软体基金会，我们有时会作为例外的情况处理。我们的决定受两个主要目标的指导，这两个主要目标是：我们的自由软体的衍生作品继续保持自由状态，以及从整体上促进软体的共享和重复利用。
由于函数库准予免费使用，在适用法准许的范围内，对函数库没有担保。除非另有书面说明，版权所有者和/或其他提供函数库的人们 "一样" 不提供任何类型的担保，不论是明确的，还是隐含的，包括但不限于可销售和适合特定用途的隐含保证。全部的风险，如函数库的质量和性能问题都由您来承担。如果函数库出现缺陷，您应当承担所有必要的服务、修复和改正的费用。
除非适用法或书面协议的要求，在任何情况下，任何版权所有者或任何按许可证条款修改和发布函数库的人们都不对您的损失负有任何责任。包括由于使用或不能使用函数库引起的任何一般的、特殊的、偶然发生的或重大的损失 (包括但不限于数据的损失，或者数据变得不精确，或者您或第三方的持续的损失，或者函数库不能和其他软体协调运行等) 。即使版权所有者和其他人提到这种损失的可能性也不例外。
GNU LESSER GENERAL PUBLIC LICENSE Version 2.1, February 1999
Copyright (C) 1991, 1999 Free Software Foundation, Inc. 51 Franklin Street, 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 Lesser GPL. It also counts as the successor of the GNU Library Public License, version 2, hence the version number 2.1.]
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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.
{{description}}
Copyright (C) {{year}} {{fullname}}
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, 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
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