 386BSD and FreeBSD were both derived from 1992 's BSD release . In January 1992 , BSDi started to release BSD / 386 , later called BSD / OS , an operating system similar to FreeBSD and based on 1992 's BSD release . AT & T filed a lawsuit against BSDi and alleged distribution of AT & T source code in violation of license agreements . The lawsuit was settled out of court and the exact terms were not all disclosed . The only one that became public was that BSDi would migrate their source base to the newer 4.4BSD @-@ Lite sources . Although not involved in the litigation , it was suggested to FreeBSD that they should also move to 4.4BSD @-@ Lite . FreeBSD 2 @.@ 0 , which was released on November 1994 , was the first version of FreeBSD without any code from AT & T. 
