7-Zip is free software with open source. The most of the code is under the GNU LGPL license. Some parts of the code are under the BSD 3-clause License. Also there is unRAR license restriction for some parts of the code. 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. If you want more information, read 7-Zip License information.
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