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From Wikipedia, the free encyclopedia
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.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
The Wikipedia link you provide here for copyleft does not say that permissive licenses are a subset of copyleft licenses, but rather contrasts the two categories. For example, you can scroll down to the table at "Types and relation to other licenses," where you can see MIT is not in the green Copyleft column.
If you check Wikipedia's Copyleft software licenses category, you'll see MIT is absent.
The Wikipedia link you provide for permissive states: