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GNU LESSER GENERAL PUBLIC LICENSE
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Version 2.1, February 1999
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Copyright (C) 1991, 1999 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 is the first released version of the Lesser GPL. It also counts
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as the successor of the GNU Library Public License, version 2, hence
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the version number 2.1.]
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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 Lesser General Public License, applies to some
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specially designated software packages--typically libraries--of the
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Free Software Foundation and other authors who decide to use it. You
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can use it too, but we suggest you first think carefully about whether
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this license or the ordinary General Public License is the better
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strategy to use in any particular case, based on the explanations below.
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When we speak of free software, we are referring to freedom of use,
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not price. Our General Public Licenses are designed to make sure that
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you have the freedom to distribute copies of free software (and charge
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for this service if you wish); that you receive source code or can get
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it if you want it; that you can change the software and use pieces of
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it in new free programs; and that you are informed that you can do
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these things.
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To protect your rights, we need to make restrictions that forbid
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distributors to deny you these rights or to ask you to surrender these
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rights. These restrictions translate to certain responsibilities for
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you if 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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you. You must make sure that they, too, receive or can get the source
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code. If you link other code with the library, you must provide
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complete object files to the recipients, so that they can relink them
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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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We protect your rights with a two-step method: (1) we copyright the
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library, and (2) we 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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To protect each distributor, we want to make it very clear that
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there is no warranty for the free library. Also, if the library is
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modified by someone else and passed on, the recipients should know
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that what they have is not the original version, so that the original
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author's reputation will not be affected by problems that might be
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introduced by others.
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Finally, software patents pose a constant threat to the existence of
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any free program. We wish to make sure that a company cannot
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effectively restrict the users of a free program by obtaining a
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restrictive license from a patent holder. Therefore, we insist that
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any patent license obtained for a version of the library must be
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consistent with the full freedom of use specified in this license.
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Most GNU software, including some libraries, is covered by the
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ordinary GNU General Public License. This license, the GNU Lesser
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General Public License, applies to certain designated libraries, and
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is quite different from the ordinary General Public License. We use
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this license for certain libraries in order to permit linking those
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libraries into non-free programs.
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When a program is linked with a library, whether statically or using
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a shared library, the combination of the two is legally speaking a
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combined work, a derivative of the original library. The ordinary
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General Public License therefore permits such linking only if the
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entire combination fits its criteria of freedom. The Lesser General
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Public License permits more lax criteria for linking other code with
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the library.
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We call this license the "Lesser" General Public License because it
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does Less to protect the user's freedom than the ordinary General
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Public License. It also provides other free software developers Less
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of an advantage over competing non-free programs. These disadvantages
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are the reason we use the ordinary General Public License for many
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libraries. However, the Lesser license provides advantages in certain
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special circumstances.
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For example, on rare occasions, there may be a special need to
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encourage the widest possible use of a certain library, so that it becomes
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a de-facto standard. To achieve this, non-free programs must be
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allowed to use the library. A more frequent case is that a free
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library does the same job as widely used non-free libraries. In this
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case, there is little to gain by limiting the free library to free
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software only, so we use the Lesser General Public License.
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In other cases, permission to use a particular library in non-free
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programs enables a greater number of people to use a large body of
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free software. For example, permission to use the GNU C Library in
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non-free programs enables many more people to use the whole GNU
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operating system, as well as its variant, the GNU/Linux operating
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system.
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Although the Lesser General Public License is Less protective of the
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users' freedom, it does ensure that the user of a program that is
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linked with the Library has the freedom and the wherewithal to run
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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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be combined with the library in order to run.
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GNU LESSER 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 or other
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Each licensee is addressed as "you".
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Activities other than copying, distribution and modification are not
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1. You may copy and distribute verbatim copies of the Library's
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d) If a facility in the modified Library refers to a function or a
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table, the facility still operates, and performs whatever part of
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application. Therefore, Subsection 2d requires that any
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be optional: if the application does not supply it, the square
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root function must still compute square roots.)
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These requirements apply to the modified work as a whole. If
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Thus, it is not the intent of this section to claim rights or contest
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3. You may opt to apply the terms of the ordinary GNU General Public
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If distribution of object code is made by offering access to copy
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Section 6 states terms for distribution of such executables.
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When a "work that uses the Library" uses material from a header file
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Whether this is true is especially significant if the work can be
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If such an object file uses only numerical parameters, data
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Library will still fall under Section 6.)
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Otherwise, if the work is a derivative of the Library, you may
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You must give prominent notice with each copy of the work that the
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executable containing the modified Library. (It is understood
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b) Use a suitable shared library mechanism for linking with the
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Library. A suitable mechanism is one that (1) uses at run time a
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copy of the library already present on the user's computer system,
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rather than copying library functions into the executable, and (2)
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will operate properly with a modified version of the library, if
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the user installs one, as long as the modified version is
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interface-compatible with the version that the work was made with.
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c) Accompany the work with a written offer, valid for at
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least three years, to give the same user the materials
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than the cost of performing this distribution.
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d) If distribution of the work is made by offering access to copy
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e) Verify that the user has already received a copy of these
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For an executable, the required form of the "work that uses the
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Library" must include any data and utility programs needed for
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It may happen that this requirement contradicts the license
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use both them and the Library together in an executable that you
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distribute.
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7. 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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permitted, and provided that you do these two things:
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a) Accompany the combined library with a copy of the same work
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Sections above.
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b) Give prominent notice with the combined library of the fact
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8. You may not copy, modify, sublicense, link with, or distribute
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the Library except as expressly provided under this License. Any
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10. Each time you redistribute the Library (or any work based on the
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You are not responsible for enforcing compliance by third parties with
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11. If, as a consequence of a court judgment or allegation of patent
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If any portion of this section is held invalid or unenforceable under any
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It is not the purpose of this section to induce you to infringe any
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This section is intended to make thoroughly clear what is believed to
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written in the body of this License.
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13. The Free Software Foundation may publish revised and/or new
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Such new versions will be similar in spirit to the present version,
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Each version is given a distinguishing version number. If the Library
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conditions either of that version or of any later version published by
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the Free Software Foundation. If the Library does not specify a
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license version number, you may choose any version ever published by
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14. If you wish to incorporate parts of the Library into other free
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write to the author to ask for permission. For software which is
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copyrighted by the Free Software Foundation, write to the Free
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Software Foundation; we sometimes make exceptions for this. Our
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decision will be guided by the two goals of preserving the free status
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of all derivatives of our free software and of promoting the sharing
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and reuse of software generally.
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NO WARRANTY
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15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
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WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
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EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
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OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
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KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
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PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
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LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
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THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
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WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
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AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
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LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
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FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
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SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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DAMAGES.
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END OF TERMS AND CONDITIONS
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How to Apply These Terms to Your New Libraries
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If you develop a new library, and you want it to be of the greatest
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possible use to the public, we recommend making it free software that
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everyone can redistribute and change. You can do so by permitting
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redistribution under these terms (or, alternatively, under the terms of the
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ordinary General Public License).
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To apply these terms, attach the following notices to the library. It is
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safest to attach them to the start of each source file to most effectively
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convey the exclusion of warranty; and each file should have at least the
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"copyright" line and a pointer to where the full notice is found.
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<one line to give the library's name and a brief idea of what it does.>
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Copyright (C) <year> <name of author>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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Also add information on how to contact you by electronic and paper mail.
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You should also get your employer (if you work as a programmer) or your
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school, if any, to sign a "copyright disclaimer" for the library, if
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necessary. Here is a sample; alter the names:
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b93447 |
|
|
|
b93447 |
Yoyodyne, Inc., hereby disclaims all copyright interest in the
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library `Frob' (a library for tweaking knobs) written by James Random Hacker.
|
|
|
b93447 |
|
|
|
b93447 |
<signature of Ty Coon>, 1 April 1990
|
|
|
b93447 |
Ty Coon, President of Vice
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|
|
b93447 |
|
|
|
b93447 |
That's all there is to it!
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|
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|