Proprietary software is any software that is not [free (as in freedom) software](free_software.md). This kind of software is basically always [evil](evil.md), in fact it is mostly [capitalist software](capitalist_software.md) designed to abuse its user in some way. Examples of proprietary software are [MS Windows](windows.md), [MacOS](macos.md), [Adobe Photoshop](photoshop.md) and almost every [game](game.md).
Proprietary software licenses are usually called [EULAs](eula.md).