User guide
29
Appendix F
Software License Agreement
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freedom and the wherewithal to run that program using a 
modified version of the Library.
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,  whereas  the  latter  must  be 
combined with the library in order to run.
GNU LESSER GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND 
MODIFICATION
This License Agreement applies to any software library 0. 
or other  program which contains a notice placed by 
the copyright holder or other authorized party saying 
it  may  be  distributed under  the  terms  of  this  Lesser 
General Public License (also called “this License”). Each 
licensee is addressed as “you”. 
A “library” means  a collection of  software  functions 
and/or data prepared so as to be conveniently linked 
with application programs (which use some of those 
functions and data) to form executables.
The “Library”, below, refers to any such software library 
or work which has been distributed under these terms. 
A “work based on the Library” means either the Library 
or any derivative work under copyright law: that is to 
say,  a  work  containing  the  Library  or  a portion  of  it, 
either verbatim or with modifications and/or translated 
straightforwardly into another language. (Hereinafter, 
translation is included without limitation in the term 
“modification”.)
“Source code” for a work means the preferred form of 
the work for making modifications to it. For a library, 
complete source code means all the source code for 
all modules it contains, plus any associated interface 
definition  files,  plus  the  scripts  used  to  control 
compilation and installation of the library.
Activities  other  than  copying,  distribution  and 
modification are not covered by this License; they are 
outside its scope. The act of running a program using 
the Library is not restricted, and output from such  a 
program  is  covered  only  if its  contents  constitute  a 
work  based  on  the  Library  (independent  of  the  use 
of the Library in a tool for writing it). Whether that is 
true depends on what the Library does and what the 
program that uses the Library does.
You  may copy and  distribute  verbatim copies of  the 1. 
Library’s complete  source  code as  you  receive  it, in 
any medium, provided that you conspicuously and 
appropriately publish on each copy an appropriate 
copyright  notice  and  disclaimer  of  warranty;  keep 
intact all the notices that refer to this License and to 
the absence of any warranty; and distribute a copy of 
this License along with the Library.
You may charge a fee for the physical act of transferring 
a copy, and you  may at  your option  offer  warranty 
protection in exchange for a fee.
You may modify your copy or copies of the Library or 2. 
any portion  of  it,  thus  forming a work  based  on  the 
Library,  and copy  and distribute  such modifications 
or work under the terms of Section 1 above, provided 
that you also meet all of these conditions:
The  modified  work  must  itself  be  a  software a) 
library.
You  must  cause  the  files  modified  to  carry b) 
prominent  notices  stating  that  you  changed  the 
files and the date of any change.
You  must  cause  the  whole  of  the  work  to  be c) 
licensed at no charge to all third parties under the 
terms of this License.
If a facility in the modified Library refers to a function d) 
or a table of data to be supplied by an application 
program that uses the facility, other than as an 
argument passed when the facility is invoked, then 
you must make a good faith effort to ensure that, 
in the event an application does not supply such 
function  or  table,  the  facility  still  operates,  and 
performs  whatever  part  of  its  purpose  remains 
meaningful.
(For  example,  a  function  in  a  library  to  compute 
square  roots  has a  purpose that is  entirely  well-
defined independent of the application. Therefore, 
Subsection  2d  requires  that  any  application-
supplied  function  or table  used by  this  function 
must be optional: if the application does not supply 
it,  the  square  root  function  must  still  compute 
square roots.)
These requirements apply to the modified work as 
a whole. If identifiable sections of that work are not 
derived  from  the  Library,  and  can  be  reasonably 
considered  independent  and  separate  works  in 
themselves, then this License, and its terms, do 
not  apply  to  those  sections  when  you  distribute 
them as separate works. But when you distribute 
the  same  sections  as  part  of  a  whole  which  is  a 
work based on the Library, the distribution of the 
whole must be on the terms of this License, whose 
permissions for other licensees extend to the entire 
whole, and thus to each and every part regardless 
of who wrote it.










