Final answer:
Linux is available under the GNU Public License (GPL) allowing for users to freely use, modify, and distribute the software. Richard Stallman and the BSD group leveraged the GPL for ensuring the freedom of their work. Linus Torvalds created the Linux kernel under the GPL, leading to diverse Linux distributions.
Explanation:
Linux is made available under the GNU Public License (GPL), which allows users to use the software freely, modify it, and distribute it while ensuring that any modifications are also shared under the same license.
Richard Stallman and the BSD group utilized the GPL to protect the freedom of their work and ensure the spread of open-source software.
Linus Torvalds created the Linux kernel in 1991 under the GPL, leading to the development of various Linux distributions like Ubuntu and Red Hat, consisting of GPL and non-GPL software packages.
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