I roto i te Pipiri 2001, whakaohotia e ngā āwangawanga i runga i Darren Reed o whakarerekētanga o te raihana IPFilter o, i whakahaeretia he arotake raihana pūnaha o te OpenBSD tauranga me te rakau pūtake. i roto i neke atu i te kotahi rau kōnae puta noa i te pūnaha i kitea ki te kia unlicensed, ambiguously raihana ranei i roto i te whakamahi ki te tikanga o te Pūnaha Whakahaere. Ki te whakarite i tika i piri katoa raihana e hāngai ana ki, i hanga e te kaupapa ki te "te pupuri i te wairua o te taketake Berkeley Unix copyrights", e whakaaetia te "whakaputa katoa-kore-tawhita Unix pūtake tohatoha". i tangohia te raihana Apache whānui whakamahia me te GNU General Public License e whakaaro rawa restrictive.I roto i te Pipiri 2001, whakaohotia e āwangawanga i runga i Darren Reed o te whakarerekētanga o te raihana IPFilter o te kupu, i whakahaeretia he arotake raihana pūnaha o te OpenBSD tauranga me rakau pūtake.
Berkeley Unix: Ko te pūnaha Berkeley Unix