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The modified BSD license (in wide use today) is very similar to the license originally used for the BSD version of Unix. The BSD license is a simple license that merely requires that all code retain the BSD license notice if redistributed in source code format, or reproduce the notice if redistributed in binary format.
The Berkeley Software Distribution [a] (BSD), also known as Berkeley Unix or BSD Unix, is a discontinued Unix operating system developed and distributed by the Computer Systems Research Group (CSRG) at the University of California, Berkeley, beginning in 1978.
Since it contained proprietary Unix code, it originally had to be distributed subject to AT&T licenses. The bundled software from AT&T was then rewritten and released as free software under the BSD license. However, this resulted in a lawsuit with Unix System Laboratories, the AT&T subsidiary responsible for Unix.
When it became apparent that the Berkeley CSRG would soon close, students and faculty at the CSRG began an effort to remove all the remaining AT&T code from the BSD and replace it with their own. This effort resulted in the public release of Net/2 in 1991, again under the BSD license. Net/2 contained enough code for a nearly complete UNIX-like ...
The names FreeBSD and OpenBSD are references to software freedom: both in cost and open source. [42] NetBSD's name is a tribute to the Internet, which brought the original developers together. [43] The first BSD mascot was the BSD daemon, named after a common type of Unix software program, a daemon.
NetBSD is a freely redistributable, open source version of the Unix-derivative Berkeley Software Distribution (BSD) computer operating system. It was the second open source BSD descendant to be formally released, after 386BSD, and continues to be actively developed.
A permissive software license, sometimes also called BSD-like or BSD-style license, [1] is a free-software license which instead of copyleft protections, carries only minimal restrictions on how the software can be used, modified, and redistributed, usually including a warranty disclaimer.
OpenBSD maintains a strict license policy, [3] preferring the ISC license and other variants of the BSD license. The project attempts to "maintain the spirit of the original Berkeley Unix copyrights," which permitted a "relatively un-encumbered Unix source distribution."