User's Manual

127
You may charge a fee for the physical act of transferring
a copy, and you may at your option o󱐯er warranty
protection in exchange for a fee.
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.)