-(Note: In some parts of the system, you may find that terms 3 and 4 have been -removed, making things even easier) +Berkeley rescinded the 3rd term (the advertising term) on 22 July 1999. +Verbatim copies of the Berkeley license in the OpenBSD tree have that +term removed. In addition, many 3rd-party BSD-style licenses consist +solely of the first two terms.
Because the OpenBSD copyright imposes no conditions beyond those imposed by the Berkeley copyright, OpenBSD can hope to share the same wide distribution and applicability as the Berkeley distributions. -It follows however, that OpenBSD can not include material which +It follows however, that OpenBSD cannot include material which includes copyrights which are more restrictive than the Berkeley copyright, or must relegate this material to a secondary status, i.e. OpenBSD as a whole is freely redistributable, but some optional @@ -198,17 +200,24 @@
-While AT&T holds the copyrights to much "Unix" code and documentation, -OpenBSD is based largely on Berkeley (BSD) distributions that contain only -material known to be free of AT&T copyrights, or material to which -AT&T has abandoned its copyright or included licensing terms similar -to the Berkeley terms. No material subject to restrictive AT&T -copyrights can be included in OpenBSD. +As part of its settlement with AT&T, Berkeley included an +AT&T copyright notice on some of the files in 4.4BSD lite and lite2. +The terms of this license are identical to the standard Berkeley license.
+Additionally, OpenBSD includes some other AT&T code with non-restrictive +copyrights, such as the reference implementation of +awk. +
-Examples of AT&T code, included subject to non-restrictive copyrights, -include some system sources such as init_main.c and the AT&T version -of awk. +
+Caldera (now known as the SCO group) is the current owner of the Unix +code copyrights. On 23 January 2002, the original Unix code (versions 1 +through seven, including 32V) was freed by Caldera. This code is now +available under a +4-term BSD-style license. +As a result, it is now possible to incorporate real Unix code into OpenBSD +(though this code is quite old and generally requires significant changes +to bring it up to date).
@@ -240,6 +249,14 @@ Derived Work.
+
+The ISC copyright is functionally equivalent to a two-term BSD +copyright with language removed that is made unnecessary by the +Berne convention. This is the preferred license for new code +incorporated into OpenBSD. A sample license is included in +the source tree as /usr/src/share/misc/license.template. +
+
The GNU Public License and licenses modeled on it impose the restriction that source code must be distributed or made available for all works that @@ -329,7 +346,7 @@
www@openbsd.org
-