If I'm not mistaken, there has already been a thread [1] on this, including an explanation [2] of the various considerations involved.
1. MARC.info - OpenBSD-misc - Thread 'BSD Documentation License?' http://marc.info/?t=120612493500005&r=1&w=2 2. MARC.info - OpenBSD-misc - Nick Holland - 'Re: BSD Documentation License?' http://marc.info/?l=openbsd-misc&m=120618838928361&w=2 -- If you don't know where you're going, any road will get you there.

