s for proprietary "there is" a private "individual" monopolistic "proprietary possession right", in "secret" sense, it becomes antonym of opening (open) as a computer-related terminology.

When the system by the personal computer (client/server system and Web system) where standardization advances calling the "open system",like the mainframe & the system the computer which are formed by the individual specification of specification due to the specific manufacturer and the like & the system which are called the "proprietary system".

In addition, the software where the source code which is represented in Linux is released the "open source software" vis-a-vis the notion that, "free software", like Windows and Mac OS the software manufacturer source code (intellectual property right) possessing as for the software which or it is monopolistic is called the "proprietary software".