'''BSD''' refers to all sorts of things, but notably the version of [UNIX] from the University of California at Berkeley (the '''B'''erkeley '''S'''oftware '''D'''istribution), the original [license] thereof and its many derivatives. [Tcl], which also started out at the University of California, uses a very similar license, though without the so-called ''advertising clause'' (i.e., you are not required to put a big message in saying that you are using Tcl and acknowledging the original authors). See the [https://en.wikipedia.org/wiki/BSD_licenses%|%Wikipedia article] for an overview of BSD-derived licenses. ** Discussion ** [Kevin Kenny] noted in the [Tcl chatroom] on 2003-06-12: "UCB removed the advertising clause in 1999." ---- [LES] I'd risk saying that, in the 21st century, whenever someone talks about BSD, they most probably mean either the BSD license or one of the three most popular "BSD [UNIX]" distributions: [FreeBSD], [NetBSD] and/or [OpenBSD]. <> Glossary | Licence | Operating System | Unix | BSD