Well, my last question is perhaps superflous, because it is
impossible to make the many authors agree, but I wonder that
FreeBSD copyrights "The compilation of software known as FreeBSD"
in its /usr/src/COPYRIGHT:
""""
The compilation of software known as FreeBSD is distributed under the
following terms:
Copyright (c) 1992-2020 The FreeBSD Project.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met: [...]
"""""
Rod.
