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it.  And you must show them these terms so they know their rights. 
 
  Our method of protecting your rights has two steps: (1) copyright 
the library, and (2) offer you this license which gives you legal 
permission to copy, distribute and/or modify the library. 
 
  Also, for each distributor's protection, we want to make certain 
that everyone understands that there is no warranty for this free 
library.  If the library is modified by someone else and passed on, we 
want its recipients to know that what they have is not the original 
version, so that any problems introduced by others will not reflect on 
the original authors' reputations. 
 
  Finally, any free program is threatened constantly by software 
patents.  We wish to avoid the danger that companies distributing free 
software will individually obtain patent licenses, thus in effect 
transforming the program into proprietary software.  To prevent this, 
we have made it clear that any patent must be licensed for everyone's 
free use or not licensed at all. 
 
  Most GNU software, including some libraries, is covered by the ordinary 
GNU General Public License, which was designed for utility programs.  This 
license, the GNU Library General Public License, applies to certain 
designated libraries.  This license is quite different from the ordinary 
one; be sure to read it in full, and don't assume that anything in it is 
the same as in the ordinary license. 
 
  The reason we have a separate public license for some libraries is that 
they blur the distinction we usually make between modifying or adding to a 
program and simply using it.  Linking a program with a library, without 
changing the library, is in some sense simply using the library, and is 
analogous to running a utility program or application program.  However, in 
a textual and legal sense, the linked executable is a combined work, a 
derivative of the original library, and the ordinary General Public License 
treats it as such. 
 
  Because of this blurred distinction, using the ordinary General 
Public License for libraries did not effectively promote software 
sharing, because most developers did not use the libraries.  We 
concluded that weaker conditions might promote sharing better. 
 
  However, unrestricted linking of non-free programs would deprive the 
users of those programs of all benefit from the free status of the 
libraries themselves.  This Library General Public License is intended to 
permit developers of non-free programs to use free libraries, while 
preserving your freedom as a user of such programs to change the free 
libraries that are incorporated in them.  (We have not seen how to achieve 
this as regards changes in header files, but we have achieved it as regards 
changes in the actual functions of the Library.)  The hope is that this 
will lead to faster development of free libraries. 
 
  The precise terms and conditions for copying, distribution and 
modification follow.  Pay close attention to the difference between a 
"work based on the library" and a "work that uses the library".  The 
former contains code derived from the library, while the latter only 
works together with the library.