User manual

make certain
that everyone understands that there is no warranty for
this free
software. If the software is modified by someone else
and passed on, we
want its recipients to know that what they have is not the
original, so
that any problems introduced by others will not reflect on
the original
authors' reputations.
Finally, any free program is threatened constantly by
software
patents. We wish to avoid the danger that redistributors
of a free
program will individually obtain patent licenses, in effect
making the
program proprietary. To prevent this, we have made it
clear that any
patent must be licensed for everyone's free use or not
licensed at all.
The precise terms and conditions for copying,
distribution and
modification follow.
GNU GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING,
DISTRIBUTION AND MODIFICATION
0. This License applies to any program or other work
which contains
a notice placed by the copyright holder saying it may be
distributed
under the terms of this General Public License. The
"Program", below,
refers to any such program or work, and a "work based
on the Program"
means either the Program or any derivative work under
copyright law:
that is to say, a work containing the Program or a portion
of it,
either verbatim or with modifications and/or translated
into another
language. (Hereinafter, translation is included without
limitation in
the term "modification".) Each licensee is addressed as
"you".
Activities other than copying, distribution and modification
are not
covered by this License; they are outside its scope. The
act of
running the Program is not restricted, and the output from
the Program
is covered only if its contents constitute a work based on
the
Program (independent of having been made by running
the Program).
Whether that is true depends on what the Program does.
1. You may copy and distribute verbatim copies of the
Program's
source code as you receive it, in 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 give any other recipients of the Program a copy of
this License
along with the Program.
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 portion
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
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 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.)
151