@nicksellen the way you asked the question implies there are specific things that are causing concern.
The answer can be anything from "single git commit is all" to "never legally possible" and it depends on a few factors (number/contactability/agreeability of authors being a major one).
@rune @Greg thanks! my reply over here https://social.coop/@nicksellen/106556082622387734 has some follow-up questions... wondering how it works when wanting to make an AGPL change to an MIT file...
Mastodon Community of Denmark (MCD) for Danes and other people to talk about Denmark or whatever.