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Free/open-source software – the source availability model used by free and open-source software (FOSS) – and closed source are two approaches to the distribution of software. Just for the record, did you know there are alternatives to WINDOWS as an operating system? Check out this link. https://www.makeuseof.com/tag/free-alternatives-to-windows-operating-systems/
Proprietary software, also known as non-free software, or closed-source software, is computer software for which the software's publisher or another person retains intellectual property rights—usually copyright of the source code, but sometimes patent rights