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 t hat you
accompany it with the complete corresponding
machine-readable source code, which must be
distributed under the terms of Sections 1 and 2
above on a medium customarily used for software
interchange.
If distribution of object code is made by offering
access to copy from a designated place, then offering
equivalent access to copy the source code from the
same place satisfies the requirement to distribute
the source code, even though third parties are not
compelled to copy the source along with the object
code.
5. A program that contains no derivative of any
portion of the Library, but is designed to work
with the Library by being compiled or linked with
it, is called a “work that uses the Library”. Such a
work, in isolation, is not a derivative work of the
Library, and therefore falls outside the scope of this
License.
However, linking a “work that uses the Library” with
the Library creates an executable that is a derivative
of the Library (because it contains portions of the
Library), rather than a “work that uses the library”.
The executable is therefore covered by this License.
Section 6 states terms for distribution of such
executables.
