Thank you Igor Pavlov for your quick reply.
Hello, I have already read that 7zip can be used on any computer, but can it be used for commercial use? The license on the website states that "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." GNU LGPL and BSD 3-clause license both allow commercial use but does the "unRAR license restriction" allow commercial use? Please note, I am not trying to sell the app or distribute...