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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 Program or any porti-
on of it, thus forming a work based on the Program, 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) You must cause the modified files to carry prominent notices sta-
ting 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 started running for such interac-
tive use in the most ordinary way, to print or display an announce-
ment 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 condi-
tions, and telling the user how to view a copy of this License. (Excep-
tion: if the Program itself is interactive but does not normally print
such an announcement, your work based on the Program is not re-
quired to print an announcement.)
These requirements apply to the modified work as a whole. If iden-
tifiable 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 tho-
se 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 collecti-
ve works based on the Program.
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