style.9: Licenses are generally immutable

[ziaee]

Summary

Probably still needs some wordsmithing.
Parent revision: https://reviews.freebsd.org/D49051

(related, can I specify blocking reviewers in git-arc.sh?)

[ziaee]

share/man/man9/style.9

107

(probably)

[imp]

This is completely wrong.

There's a number of nuanced things that need to be communicate.

License Text (not copyright text) should not be changed.
Adding a copyright to the existing license is possible when it's substantial (but we only have a loose rule of thumb of 20-25%)
Rewriting doesn't need to be "complete" to relicense: You can get permission of the original authors, or you can "substantially" rewrite and be justified in relicensing
And... well, there's a dozen cases here.

We have a longer text in the handbook, but even that needs work...

[ziaee]

Thanks! I'll work on that!