oh wow, https://en.wikipedia.org/wiki/ISC_license is completely wrong because it cites the FSF who have got their history mixed up: https://www.gnu.org/licenses/license-list.en.html#ISC

It was ISC changed the license to add "and/or", OpenBSD still uses the original

I could change it but it will probably be reverted because the FSF said it so it must be true. I could use repo histories and diffs as sources but wikipedia doesn't like primary sources.