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Unix is NOT open source, it is proprietary copyrighted code owned by AT&T and you must purchase a license to use it, as you do on Windows and Mac OS X.

However both Linux and GNU are open source OSs with equivalent functionality to Unix.

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Q: Why unix is an open source operating system?
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Related questions

OS is an open-source operating system?

LINUX and Unix OS is open-source operating system.....! but Windows version OS is not the open-source operating system....!


Which operating system has the free and open source software?

Unix and Linux


Free unix operating system source code?

If I understand your question....vague as it is....yes, the Unix OS source code is free and open source.


Is HP-UX an open-source operating system?

No, HP-UX is the commercial distribution of Unix from HP. It is proprietary and not open source.


Example open-source operating system?

There are several open-source operating systems, most of which appear to be clones of Unix. Examples include FreeBSD, Linux, Minix.


State the operating system that has free and open source software?

Linux or Unix are open source and some are versions are free and others aren't. Unix is based off of Linux, and both have many different variations. One popular Unix system is Ubuntu


What is OpenBSD?

OpenBSD is a free an open-source Unix-like operating system, with a primary focus on security.


What is Android classified as?

Android is classified as a Unix based, open-source mobile operating system for phones and tablets.


What is the name of one operating system?

There are different types of operating systems. The most popular ones are Microsoft Windows and Linux which is an open- source operating system.


Is UNIX-operating system a free software?

Currently, The Open Group owns the "Unix" trademark. No, Unix branded operating systems are proprietary and copyrighted. They are not free or open systems software. From its start until 1993, Unix distributions included all their source code. Programmers have made many free and open Unix-like operating systems, including Linux, NetBSD, FreeBSD, OpenBSD, Dragonfly BSD, Mach, OpenSolaris, etc.


Why is Unix open source?

Unix is not open source, it is proprietary. Linux is the open-source version of Unix.


What operating system is NetBSD based on?

NetBSD is a free, open-source, unix like, multi-platform operating system descended from Berkeley Software Distribution (BSD) and based on 4.4BSD Lite.