I just saw that OSS v4.0 has been released under a 2-clause BSD license. [1]
I haven't seen it mentioned on the list yet and I know there's been a lot of audio related development going on in -current so I just thought I'd mention it for anyone who might be interested. Their website hasn't been completely updated to reflect the new BSDL-release, but the press release and COPYING file in [2] say it's for real. [1] http://www.opensound.com/press/2008/oss-bsd.txt [2] http://www.4front-tech.com/developer/sources/stable/bsd/oss-v4.0-build1012-src-bsd.tar.bz2