> The MIT, BSD, and ISC licenses are “permissive licenses”. They are extremely short and essentially say “do whatever you want with this, just don’t sue me.”
The Apache license says “do whatever you want with this, just don’t sue me” but does so with many more words, which lawyers like because it adds specificity. It also contains a patent license and retaliation clause which is designed to prevent patents (including patent trolls) from encumbering the software project.