Question

What is Proprietary software??​

Answer 1

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Proprietary software, also known as closed-source software, is a non-free 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.

Answer 2

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Proprietary software doesn't allow people to look at its code or modify it and restrict its distribution. Such software can be freely available or can be purchased.

Examples:- Microsoft Windows, Microsoft Office, Mac-OS, iOS etc.