OpenBSD - PF, A csomagszűrô 2001.05.29. ipf eltávolítása a rendszerbôl Log message: Remove ipf. Darren Reed has interpreted his (old, new, whichever) licence in a way that makes ipf not free according to the rules we established over 5 years ago, at www.openbsd.org/goals.html (and those same basic rules govern the other *BSD projects too). Specifically, Darren says that modified versions are not permitted. But software which OpenBSD uses and redistributes must be free to all (be they people or companies), for any purpose they wish to use it, including modification, use, peeing on, or even integration into baby mulching machines or atomic bombs to be dropped on Australia.