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a) You must cause the modified files to carry prominent notices stating that you changed
the files 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 modified program normally reads commands interactively when run, you must
cause it, when running is commenced 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 modified work as a whole. If identifiable 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, the
intent is to exercise the right to control the distribution of derivative or collective works based
on the Program.
In addition, mere aggregation of another work not based on the Program with the Program
(or with a work based on the Program) on a volume of a storage or distribution medium does
not bring the other work under the scope of this License.
3. You may copy and distribute the Program (or a work based on it, under Section 2) in object
code or executable form under the terms of Sections 1 and 2 above, provided that you also
do one of the following:
a) 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; or,
b) Accompany it with a written offer, valid for at least three years, to give any third party,
for a charge no more than your cost of physically performing source distribution, a com-
plete machine-readable copy of the corresponding source code, to be distributed under
the terms of Sections 1 and 2 above on a medium customarily used for software inter-
change; or,
c) Accompany it with the information you received as to the offer to distribute correspond-
ing source code. (This alternative is allowed only for noncommercial distribution and only
if you received the program in object code or executable form with such an offer, in accord
with Subsection b above.)
The source code for a work means the preferred form of the work for making modifications to
it. For an executable work, 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 compi-
lation and installation of the executable. However, as a special exception, the source code dis-
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