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Computer Systems Research Group
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==History== Professor [[Bob Fabry]] of Berkeley acquired a UNIX source license from AT&T in 1974. His group started to modify UNIX, and distributed their version as the [[Berkeley Software Distribution]] (BSD). In April 1980, Fabry signed a contract with [[DARPA]] to develop UNIX even further and accommodate the specific requirements of the [[ARPAnet]].<ref>{{citation |author=Marshall Kirk McKusick |author-link=Marshall Kirk McKusick |chapter=Twenty Years of Berkeley Unix: From AT&T-Owned to Freely Redistributable |title=[[Open Sources: Voices from the Open Source Revolution]] |year=1999}}</ref> With this funding, Fabry created the Computer Systems Research Group. By the early 1980s, CSRG was the best-known non-commercial Unix developer, and a majority of Unix sites used at least some Berkeley software. AT&T included some CSRG work in [[Unix System V]].<ref name="fiedler198310">{{cite news |url=https://archive.org/stream/byte-magazine-1983-10/1983_10_BYTE_08-10_UNIX#page/n133/mode/2up |title=The Unix Tutorial / Part 3: Unix in the Microcomputer Marketplace |work=BYTE |date=October 1983 |access-date=January 30, 2015 |author=Fiedler, Ryan |pages=132}}</ref> During the 1970s and 1980s, AT&T/USL raised the commercial licensing fee for UNIX from $20,000 to $100,000β$200,000. This became a big problem for small research labs and companies who used BSD, and the CSRG decided to replace all the source code that originated from AT&T. They succeeded in 1994, but AT&T disagreed and [[USL v. BSDi|sued Berkeley]]. After a court settlement in 1994, CSRG distributed the final version of BSD, called 4.4BSD-Lite2. The group disbanded in 1995.
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