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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.
BSD was sponsored by DARPA until 1988, [3] which led to the implementation of ARPANET and later the TCP/IP stack to Unix by BSD, [4] which were released in BSD NET/1 in 1988. The codebase had been rewritten so much that as little as 5% of BSD contained original AT&T code, [4] and therefore NET/1 was released without an AT&T source license. [3]
Because this Berkeley Software Distribution (BSD) contained copyrighted AT&T Unix source code, it was only available to organizations with a source code license for Unix from AT&T. Students and faculty at the CSRG audited the software code for the TCP/IP stack, removing all the AT&T intellectual property, and released it to the general public ...
In addition, the permissive nature of the BSD license has allowed many other operating systems, both free and proprietary, to incorporate BSD code. For example, Microsoft Windows has used BSD-derived code in its implementation of TCP/IP [21] and bundles recompiled versions of BSD's command-line networking tools since Windows 2000. [22]
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.
Berkeley Software Design, Inc. (BSDI or, later, BSDi), was a software company founded in 1991 by members of the Computer Systems Research Group (CSRG), known for developing and selling BSD/OS (originally known as BSD/386), a commercial and partially proprietary variant of the BSD Unix operating system for PCs.
Berkeley Software Distribution (BSD) is the name of the Unix derivative distributed in the 1970s from the University of California, Berkeley. The name is also used collectively for the modern descendants of this derivative.
BSD was originally derived from Unix, using the complete source code for Sixth Edition Unix for the PDP-11 from Bell Labs as a starting point for the First Berkeley Software Distribution, or 1BSD. A series of updated versions for the PDP-11 followed (the 2.xBSD releases).