COPYING
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     1 		  GNU LIBRARY GENERAL PUBLIC LICENSE
     1 		  GNU LESSER GENERAL PUBLIC LICENSE
     2 		       Version 2, June 1991
     2 		       Version 2.1, February 1999
     3 
     3 
     4  Copyright (C) 1991 Free Software Foundation, Inc.
     4  Copyright (C) 1991, 1999 Free Software Foundation, Inc.
     5     		    59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
     5      51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
     6  Everyone is permitted to copy and distribute verbatim copies
     6  Everyone is permitted to copy and distribute verbatim copies
     7  of this license document, but changing it is not allowed.
     7  of this license document, but changing it is not allowed.
     8 
     8 
     9 [This is the first released version of the library GPL.  It is
     9 [This is the first released version of the Lesser GPL.  It also counts
    10  numbered 2 because it goes with version 2 of the ordinary GPL.]
    10  as the successor of the GNU Library Public License, version 2, hence
       
    11  the version number 2.1.]
    11 
    12 
    12 			    Preamble
    13 			    Preamble
    13 
    14 
    14   The licenses for most software are designed to take away your
    15   The licenses for most software are designed to take away your
    15 freedom to share and change it.  By contrast, the GNU General Public
    16 freedom to share and change it.  By contrast, the GNU General Public
    16 Licenses are intended to guarantee your freedom to share and change
    17 Licenses are intended to guarantee your freedom to share and change
    17 free software--to make sure the software is free for all its users.
    18 free software--to make sure the software is free for all its users.
    18 
    19 
    19   This license, the Library General Public License, applies to some
    20   This license, the Lesser General Public License, applies to some
    20 specially designated Free Software Foundation software, and to any
    21 specially designated software packages--typically libraries--of the
    21 other libraries whose authors decide to use it.  You can use it for
    22 Free Software Foundation and other authors who decide to use it.  You
    22 your libraries, too.
    23 can use it too, but we suggest you first think carefully about whether
    23 
    24 this license or the ordinary General Public License is the better
    24   When we speak of free software, we are referring to freedom, not
    25 strategy to use in any particular case, based on the explanations below.
    25 price.  Our General Public Licenses are designed to make sure that you
    26 
    26 have the freedom to distribute copies of free software (and charge for
    27   When we speak of free software, we are referring to freedom of use,
    27 this service if you wish), that you receive source code or can get it
    28 not price.  Our General Public Licenses are designed to make sure that
    28 if you want it, that you can change the software or use pieces of it
    29 you have the freedom to distribute copies of free software (and charge
    29 in new free programs; and that you know you can do these things.
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    31 it if you want it; that you can change the software and use pieces of
       
    32 it in new free programs; and that you are informed that you can do
       
    33 these things.
    30 
    34 
    31   To protect your rights, we need to make restrictions that forbid
    35   To protect your rights, we need to make restrictions that forbid
    32 anyone to deny you these rights or to ask you to surrender the rights.
    36 distributors to deny you these rights or to ask you to surrender these
    33 These restrictions translate to certain responsibilities for you if
    37 rights.  These restrictions translate to certain responsibilities for
    34 you distribute copies of the library, or if you modify it.
    38 you if you distribute copies of the library or if you modify it.
    35 
    39 
    36   For example, if you distribute copies of the library, whether gratis
    40   For example, if you distribute copies of the library, whether gratis
    37 or for a fee, you must give the recipients all the rights that we gave
    41 or for a fee, you must give the recipients all the rights that we gave
    38 you.  You must make sure that they, too, receive or can get the source
    42 you.  You must make sure that they, too, receive or can get the source
    39 code.  If you link a program with the library, you must provide
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    40 complete object files to the recipients so that they can relink them
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    41 with the library, after making changes to the library and recompiling
    45 with the library after making changes to the library and recompiling
    42 it.  And you must show them these terms so they know their rights.
    46 it.  And you must show them these terms so they know their rights.
    43 
    47 
    44   Our method of protecting your rights has two steps: (1) copyright
    48   We protect your rights with a two-step method: (1) we copyright the
    45 the library, and (2) offer you this license which gives you legal
    49 library, and (2) we offer you this license, which gives you legal
    46 permission to copy, distribute and/or modify the library.
    50 permission to copy, distribute and/or modify the library.
    47 
    51 
    48   Also, for each distributor's protection, we want to make certain
    52   To protect each distributor, we want to make it very clear that
    49 that everyone understands that there is no warranty for this free
    53 there is no warranty for the free library.  Also, if the library is
    50 library.  If the library is modified by someone else and passed on, we
    54 modified by someone else and passed on, the recipients should know
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    52 version, so that any problems introduced by others will not reflect on
    56 author's reputation will not be affected by problems that might be
    53 the original authors' reputations.
    57 introduced by others.
    54 
    58 
    55   Finally, any free program is threatened constantly by software
    59   Finally, software patents pose a constant threat to the existence of
    56 patents.  We wish to avoid the danger that companies distributing free
    60 any free program.  We wish to make sure that a company cannot
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    62 restrictive license from a patent holder.  Therefore, we insist that
    59 we have made it clear that any patent must be licensed for everyone's
    63 any patent license obtained for a version of the library must be
    60 free use or not licensed at all.
    64 consistent with the full freedom of use specified in this license.
    61 
    65 
    62   Most GNU software, including some libraries, is covered by the ordinary
    66   Most GNU software, including some libraries, is covered by the
    63 GNU General Public License, which was designed for utility programs.  This
    67 ordinary GNU General Public License.  This license, the GNU Lesser
    64 license, the GNU Library General Public License, applies to certain
    68 General Public License, applies to certain designated libraries, and
    65 designated libraries.  This license is quite different from the ordinary
    69 is quite different from the ordinary General Public License.  We use
    66 one; be sure to read it in full, and don't assume that anything in it is
    70 this license for certain libraries in order to permit linking those
    67 the same as in the ordinary license.
    71 libraries into non-free programs.
    68 
    72 
    69   The reason we have a separate public license for some libraries is that
    73   When a program is linked with a library, whether statically or using
    70 they blur the distinction we usually make between modifying or adding to a
    74 a shared library, the combination of the two is legally speaking a
    71 program and simply using it.  Linking a program with a library, without
    75 combined work, a derivative of the original library.  The ordinary
    72 changing the library, is in some sense simply using the library, and is
    76 General Public License therefore permits such linking only if the
    73 analogous to running a utility program or application program.  However, in
    77 entire combination fits its criteria of freedom.  The Lesser General
    74 a textual and legal sense, the linked executable is a combined work, a
    78 Public License permits more lax criteria for linking other code with
    75 derivative of the original library, and the ordinary General Public License
    79 the library.
    76 treats it as such.
    80 
    77 
    81   We call this license the "Lesser" General Public License because it
    78   Because of this blurred distinction, using the ordinary General
    82 does Less to protect the user's freedom than the ordinary General
    79 Public License for libraries did not effectively promote software
    83 Public License.  It also provides other free software developers Less
    80 sharing, because most developers did not use the libraries.  We
    84 of an advantage over competing non-free programs.  These disadvantages
    81 concluded that weaker conditions might promote sharing better.
    85 are the reason we use the ordinary General Public License for many
    82 
    86 libraries.  However, the Lesser license provides advantages in certain
    83   However, unrestricted linking of non-free programs would deprive the
    87 special circumstances.
    84 users of those programs of all benefit from the free status of the
    88 
    85 libraries themselves.  This Library General Public License is intended to
    89   For example, on rare occasions, there may be a special need to
    86 permit developers of non-free programs to use free libraries, while
    90 encourage the widest possible use of a certain library, so that it becomes
    87 preserving your freedom as a user of such programs to change the free
    91 a de-facto standard.  To achieve this, non-free programs must be
    88 libraries that are incorporated in them.  (We have not seen how to achieve
    92 allowed to use the library.  A more frequent case is that a free
    89 this as regards changes in header files, but we have achieved it as regards
    93 library does the same job as widely used non-free libraries.  In this
    90 changes in the actual functions of the Library.)  The hope is that this
    94 case, there is little to gain by limiting the free library to free
    91 will lead to faster development of free libraries.
    95 software only, so we use the Lesser General Public License.
       
    96 
       
    97   In other cases, permission to use a particular library in non-free
       
    98 programs enables a greater number of people to use a large body of
       
    99 free software.  For example, permission to use the GNU C Library in
       
   100 non-free programs enables many more people to use the whole GNU
       
   101 operating system, as well as its variant, the GNU/Linux operating
       
   102 system.
       
   103 
       
   104   Although the Lesser General Public License is Less protective of the
       
   105 users' freedom, it does ensure that the user of a program that is
       
   106 linked with the Library has the freedom and the wherewithal to run
       
   107 that program using a modified version of the Library.
    92 
   108 
    93   The precise terms and conditions for copying, distribution and
   109   The precise terms and conditions for copying, distribution and
    94 modification follow.  Pay close attention to the difference between a
   110 modification follow.  Pay close attention to the difference between a
    95 "work based on the library" and a "work that uses the library".  The
   111 "work based on the library" and a "work that uses the library".  The
    96 former contains code derived from the library, while the latter only
   112 former contains code derived from the library, whereas the latter must
    97 works together with the library.
   113 be combined with the library in order to run.
    98 
   114 
    99   Note that it is possible for a library to be covered by the ordinary
   115 		  GNU LESSER GENERAL PUBLIC LICENSE
   100 General Public License rather than by this special one.
       
   101 
       
   102 		  GNU LIBRARY GENERAL PUBLIC LICENSE
       
   103    TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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   352 
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   374   11. If, as a consequence of a court judgment or allegation of patent
   354 infringement or for any other reason (not limited to patent issues),
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   392   13. The Free Software Foundation may publish revised and/or new
   413   13. The Free Software Foundation may publish revised and/or new
   393 versions of the Library General Public License from time to time.
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