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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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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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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
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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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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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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
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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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"work based on the library" and a "work that uses the library". The
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former contains code derived from the library, whereas the latter must
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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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"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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all the source code for all modules it contains, plus any associated
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interface definition files, plus the scripts used to control
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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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ordinary GNU General Public License has appeared, then you can specify
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that version instead if you wish.) Do not make any other change in
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Once this change is made in a given copy, it is irreversible for
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that copy, so the ordinary GNU General Public License applies to all
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subsequent copies and derivative works made from that copy.
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distribute the object code for the work under the terms of Section 6.
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Any executables containing that work also fall under Section 6,
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whether or not they are linked directly with the Library itself.
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6. As an exception to the Sections above, you may also combine or
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link a "work that uses the Library" with the Library to produce a
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work containing portions of the Library, and distribute that work
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accompany the operating system. Such a contradiction means you cannot
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use both them and the Library together in an executable that you
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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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facilities not covered by this License, and distribute such a combined
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restrictions on the recipients' exercise of the rights granted herein.
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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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infringement or for any other reason (not limited to patent issues),
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conditions are imposed on you (whether by court order, agreement or
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the only way you could satisfy both it and this License would be to
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refrain entirely from distribution of the Library.
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If any portion of this section is held invalid or unenforceable under
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any particular circumstance, the balance of the section is intended to
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apply, and the section as a whole is intended to apply in other
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If any portion of this section is held invalid or unenforceable under any
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particular circumstance, the balance of the section is intended to apply,
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and the section as a whole is intended to apply in other circumstances.
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It is not the purpose of this section to induce you to infringe any
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patents or other property right claims or to contest validity of any
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12. If the distribution and/or use of the Library is restricted in
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certain countries either by patents or by copyrighted interfaces, the
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original copyright holder who places the Library under this License
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may add an explicit geographical distribution limitation excluding those
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countries, so that distribution is permitted only in or among
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countries not thus excluded. In such case, this License incorporates
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the limitation as if written in the body of this License.
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original copyright holder who places the Library under this License may add
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an explicit geographical distribution limitation excluding those countries,
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so that distribution is permitted only in or among countries not thus
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excluded. In such case, this License incorporates the limitation as if
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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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versions of the Lesser General Public License from time to time.
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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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the Free Software Foundation.
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14. If you wish to incorporate parts of the Library into other free
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programs whose distribution conditions are incompatible with these,
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write to the author to ask for permission. For software which is
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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
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of the ordinary General Public License).
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To apply these terms, attach the following notices to the library.
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It is safest to attach them to the start of each source file to most
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effectively convey the exclusion of warranty; and each file should
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have at least the "copyright" line and a pointer to where the full
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<one line to give the library's name and a brief idea of what it
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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 of the License, or (at your option) any later version.
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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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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
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You should also get your employer (if you work as a programmer) or
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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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Yoyodyne, Inc., hereby disclaims all copyright interest in the
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library `Frob' (a library for tweaking knobs) written by James
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library `Frob' (a library for tweaking knobs) written by James Random Hacker.
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<signature of Ty Coon>, 1 April 1990
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Ty Coon, President of Vice
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That's all there is to it!