LICENSE-GPL.txt

Box Backup, http://www.boxbackup.org/

Copyright (c) 2003-2015, Ben Summers and contributors.
All rights reserved.

Note that this project uses mixed licensing. Any file with this license
attached, or where the code LICENSE-GPL appears on the first line, falls
under the "Box Backup GPL" license. See the file COPYING.txt for more
information about this license.

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This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is 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.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

[http://www.gnu.org/licenses/old-licenses/gpl-2.0.html#SEC4]

As a special exception to the GPLv2, the Box Backup Project gives
permission to link any code falling under this license (the Box Backup
GPL) with any software that can be downloaded from
the OpenSSL website [http://www.openssl.org] under either the
"OpenSSL License" or the "Original SSLeay License", and to distribute
the linked executables under the terms of the "Box Backup GPL" license.

As a special exception to the GPLv2, the Box Backup Project gives
permission to link any code falling under this license (the Box Backup
GPL) with any version of Microsoft's Volume Shadow Copy Service 7.2 SDK
or Microsoft Windows Software Development Kit (SDK), including
vssapi.lib, that can be downloaded from the Microsoft website
[*.microsoft.com], and to distribute the linked executables under the
terms of the "Box Backup GPL" license.