copying.txt

MiniSip Client with DomainKeys Authentication, Sip, Audio communications, Echo Cancel

		    GNU GENERAL PUBLIC LICENSE Version 2,
		       June 1991

 Copyright (C) 1989, 1991 Free Software Foundation, Inc.  59
                       Temple Place, Suite 330, Boston, MA
                       02111-1307 USA Everyone is permitted
                       to copy and distribute verbatim
                       copies of this license document, but
                       changing it is not allowed.

			    Preamble

  The licenses for most software are designed to take away
your freedom to share and change it.  By contrast, the GNU
General Public License is intended to guarantee your freedom
to share and change free software--to make sure the software
is free for all its users.  This General Public License
applies to most of the Free Software Foundation's software
and to any other program whose authors commit to using it.
(Some other Free Software Foundation software is covered by
the GNU Library General Public License instead.)  You can
apply it to your programs, too.

  When we speak of free software, we are referring to
freedom, not price.  Our General Public Licenses are
designed to make sure that you have the freedom to
distribute copies of free software (and charge for this
service if you wish), that you receive source code or can
get it if you want it, that you can change the software or
use pieces of it in new free programs; and that you know you
can do these things.

  To protect your rights, we need to make restrictions that
forbid anyone to deny you these rights or to ask you to
surrender the rights.  These restrictions translate to
certain responsibilities for you if you distribute copies of
the software, or if you modify it.

  For example, if you distribute copies of such a program,
whether gratis or for a fee, you must give the recipients
all the rights that you have.  You must make sure that they,
too, receive or can get the source code.  And you must show
them these terms so they know their rights.

  We protect your rights with two steps: (1) copyright the
software, and (2) offer you this license which gives you
legal permission to copy, distribute and/or modify the
software.

  Also, for each author's protection and ours, we want to
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.)

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