> Well, although SPDX counts 665 licences, there really just 3 main kinds:

> 1. licences with no restrictions (like MIT)

> 2. licences that require you credit the original author ("attribution" licences, including the Apache Licence)

> 3. licences that require you credit the original author and that derivative works have the same licence ("copyleft"/"share-alike" licences like the GPL)

MIT requires attribution, doesn't it? MIT (permissive) / MPL (non-viral copyleft) / AGPL (viral copyleft) seems like a better grouping to me; I rarely find myself reaching for any other licenses.

I do wish there were a shorter copyleft license though. I appreciate how transparent and readable MIT is.