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70 Apéndice
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.
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
6
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.)
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 complete
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 interchange; or,
c) Accompany it with the
information you received as to the
offer to distribute corresponding
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 compilation and installation
of the executable. However, as a
special exception, the source code
distributed need not include anything
that is normally distributed (in either
source or binary form) with the major
components (compiler, kernel, and
so on) of the operating system on
which the executable runs, unless that
component itself accompanies the
executable.
If distribution of executable or object
code is made by offering access to
copy from a designated place, then
offering equivalent access to copy
the source code from the same place
counts as distribution of the source
code, even though third parties are
not compelled to copy the source
along with the object code.
4. You may not copy, modify, sublicense,
or distribute the Program except as
expressly provided under this License.
Any attempt otherwise to copy,
modify, sublicense or distribute the
Program is void, and will automatically
terminate your rights under this
License. However, parties who have
received copies, or rights, from you
under this License will not have their
licenses terminated so long as such
parties remain in full compliance.
5. You are not required to accept this
License, since you have not signed