During the 1970s and 1980s, AT&T raised the licensing fee for UNIX to $100,000–$200,000. This became a big problem for small research labs and companies who used BSD and the CSRG set up a goal for themselves to replace all the source code that originated from AT&T. They succeeded in 1994, but AT&T didn't agree and took Berkeley to court. After the settlement in 1994, CSRG distributed its last versions, called 4.4BSD-Lite (BSD-licensed) and 4.4BSD-Encumbered (UNIX-licensed).
The group was disbanded in 1995, though not without leaving a legacy - OpenBSD, NetBSD and FreeBSD are all based on the 4.4BSD-Lite distribution and continue to play an important role in the open-source UNIX community today, including dictating the style of C programming used via KNF in the style man page.
Unix pioneer ends BSD research; UCal Berkeley blames lawsuit by USL. (Berkeley Software Design; Unix Systems Laboratories Inc.; University of California Berkeley's Computer Systems Research Group) (Field Report)
Oct 01, 1992; UCal Berkeley blames lawsuit by USL After 19 years of notable contributions to the Unix world, both in developing software and in...