Proprietary means that someone or a corporation has ownership over something. When it comes to software, Proprietary software means that you often cannot redistribute a program, see the source code or make changes to the program, cannot make a detrivative of the software, and you have to use the software as outlined by a End User License Agreement or else access to that software could potientally be revoked with the worst outcome being that you get into legal trouble due to some corporation bullying you with the law. It can either be closed source or source available. Proprietary Software is often commercial and is "protected" by monopoly laws. This means that legally, there is an owner of the software that can restrict how one uses a proprietary program and they can do it with means such as DRM.
Examples of Proprietary Software include Windows, MacOS, most video games, steam, discord, adobe software, spotify, proprietary versions of chromium such as google chrome and Microsoft Edge, etc.
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