this post was submitted on 24 Mar 2025
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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This is one of the old-time original arguments in the OSS community.
The crux of the matter is that the GNU licenses require that modifications be released back to the community. Other "more permissible" licenses like MIT do not.
So if you want to make a commercial version of X, and X is under a GPL, then any changes you make need to be released under the GPL. The idea being "I shared this code with the community with the intent that you can use it for free and modify it as you like, but you need to share back what you do." Also called "Share and share alike".
This defends against "embrace, extend, extinguish" tactics that companies like Microsoft has loved to do. They can't take your code, modify it for their own purposes and re-sell it possibly making a more popular version that is now proprietary.
Somewhat ironic example.
X (Xorg) has been MT licensed for 40 years. So is Wayland. So is Mesa.
I think Xorg is a good example of the real world risks for something like core utils. If you did not know or care until now that X and Wayland were MIT licensed, you probably do not need to care too much about utils licensing either.
Here's a better example: the use of GPL software (primarily Linux and busybox) by Linksys when they made their wrt54g router was used to compel them into releasing the source code of the firmware for that router. Subsequent GPL enforcement by the SFC made Cisco release full firmware sources for a whole series of Linksys routers. Thanks to those sources openwrt, ddwrt and several other open source router firmwares developed.
I can now run three openwrt routers in my home purely thanks to the GPL. If those projects had been MIT licensed, Linksys and Cisco could have just politely told everyone to go suck a lemon because they would have had no obligation to release anything.