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.
1. You may copy and distribute verbatim copies of the 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.
2. You may modify your copy or copies of the Library or 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:
a) The modified work must itself be a software library.
b) You must cause the files modified to carry prominent notices stating that you changed
the files and the date of any change.
c) You must cause the whole of the work to be licensed at no charge to all third parties
under the terms of this License.
d) If a facility in the modified Library refers to a function 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.
Thus, it is not the intent of this section to claim rights or contest your rights to work
written entirely by you; rather, the intent is to exercise the right to control the
distribution of derivative or collective works based on the Library.
In addition, mere aggregation of another work not based on the Library with the Library
(or with a work based on the Library) on a volume of a storage or distribution medium
does not bring the other work under the scope of this License.
3. You may opt to apply the terms of the ordinary GNU General Public License instead of
this License to a given copy of the Library. To do this, you must alter all the notices that
refer to this License, so that they refer to the ordinary GNU General Public License,
version 2, instead of to this License. (If a newer version than version 2 of the ordinary
GNU General Public License has appeared, then you can specify that version instead if
you wish.) Do not make any other change in these notices.
Once this change is made in a given copy, it is irreversible for that copy, so the ordinary
GNU General Public License applies to all subsequent copies and derivative works made
from that copy.
This option is useful when you wish to copy part of the code of the Library into a
program that is not a library.
4. You may copy and distribute the Library (or a portion or derivative of it, under Section
2) in object code or executable form under the terms of Sections 1 and 2 above provided
112
