Panasonic KX-NT680 Manual page 56

Copyright Notice and License Information
This product incorporates the following software:
(1) software developed independently by or for Panasonic Corporation,
(2) software owned by a third party and licensed to Panasonic Corporation,
(3) software licensed under the GNU General Public License, Version 2.0
(GPL V2.0),
(4) software licensed under the GNU LESSER General Public License,
Version 2.1 (LGPL V2.1), and/or
(5) open source software other than the software licensed under the GPL
V2.0 and/or LGPL V2.1.
The software categorized as (3) - (5) are distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY, without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Please
refer to the detailed terms and conditions thereof shown in our website below.
At least three (3) years from delivery of this product, Panasonic Corporation
will give to any third party who contacts us at the contact information provided
below, for a charge no more than the cost of physically performing source
code distribution, a complete, machine-readable copy of the corresponding
source code covered under GPL V2.0, LGPL V2.1 or other licenses with the
obligation to do so, as well as the respective copyright notice thereof.
KX-NT511/KX-NT551/KX-NT553/KX-NT556/KX-NT630/KX-NT680:
https://panasonic.net/cns/pcc/support/pbx/
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