If there can be a state of “You may read” with respect to text, then there can be a state of “You can use it.” with respect to software.
First you write software to serve your own purposes, then you release it to the public as “ok to use”. This is not different.
Now, if we return this analogy to writing, we get “First the text is written to serve one’s own purpose, and then it is published as ‘may I read it’”.
relevance - You may read it, but you don’t have to.
This page is auto-translated from /nishio/読んでもいいと使ってもいい using DeepL. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. I’m very happy to spread my thought to non-Japanese readers.