User's Manual

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2. You may modify your copy or copies of the Program or any
portion of it, thus forming a work based on the Program, and
copy and distribute such modications or work under the
terms of Section 1 above, provided that you also meet all of
these conditions:
a) You must cause the modied les to carry prominent
notices stating that you changed the les and the date of
any change.
b) You must cause any work that you distribute or publish,
that in whole or in part contains or is derived from the
Program or any part thereof, to be licensed as a whole
at no charge to all third parties under the terms of this
License.
c) If the modied program normally reads commands
interactively when run, you must cause it, when started
running for such interactive use in the most ordinary
way, to print or display an announcement including an
appropriate copyright notice and a notice that there is
no warranty (or else, saying that you provide a warranty)
and that users may redistribute the program under these
conditions, and telling the user how to view a copy of
thisLicense.(Exception:iftheProgramitselfisinteractive
but does not normally print such an announcement, your
work based on the Program is not required to print an
announcement.)
These requirements apply to the modied work as a whole.
If identiable sections of that work are not derived from the
Program, 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 Program, 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,