One Commander uses 7z.dll from 7-Zip. 7z.dll is distributed under GNU LGPL + unRAR restriction.
To read license, visit: http://www.7-zip.org/license.txt

By using One Commander you also agree to terms and conditions for usage of 7-Zip.

One Commander is not licensed under the MIT license.


7-Zip license:

  7-Zip
  ~~~~~
  License for use and distribution
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  7-Zip Copyright (C) 1999-2015 Igor Pavlov.

  Licenses for files are:

    1) 7z.dll: GNU LGPL + unRAR restriction
    2) All other files:  GNU LGPL

  The GNU LGPL + unRAR restriction means that you must follow both 
  GNU LGPL rules and unRAR restriction rules.


  Note: 
    You can use 7-Zip on any computer, including a computer in a commercial 
    organization. You don't need to register or pay for 7-Zip.


  GNU LGPL information
  --------------------

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You can receive a copy of the GNU Lesser General Public License from 
    http://www.gnu.org/


  unRAR restriction
  -----------------

    The decompression engine for RAR archives was developed using source 
    code of unRAR program.
    All copyrights to original unRAR code are owned by Alexander Roshal.

    The license for original unRAR code has the following restriction:

      The unRAR sources cannot be used to re-create the RAR compression algorithm, 
      which is proprietary. Distribution of modified unRAR sources in separate form 
      or as a part of other software is permitted, provided that it is clearly
      stated in the documentation and source comments that the code may
      not be used to develop a RAR (WinRAR) compatible archiver.


  --
  Igor Pavlov
