7-Zip is open source software. Most of source code is under the GNU LGPL license. The code is under unRAR a mixed license: GNU LGPL + unRAR restrictions. Check license information here: 7-Zip license.
You can use 7-Zip on any computer, including a computer in a commercial organization. You do not need to register or pay for 7-Zip. But you can make a donation to support the further development of 7-Zip.
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