+ 2014-02-19 Wed 11:03, Fabian Keil freebsd-listen@fabiankeil.de:
My point is that in case of permissive licenses the licensee is already free to reuse the software as part of a proprietary product and thus doesn't need copyright assignment.
Copyright assignments are done for other reasons.
You really really underestimate the power that copyright assignments give to the assignee. The assignee is much more powerful than a mere licensee (for instance, to sue for infringement).