4.4BSD Lite
From Computer History Wiki
4.4 BSD Lite was the second last release from the CSRG. After they had to withdraw the Net/2 source, the files found to be in contention with Unix/32V were removed, and this distribution was released.
Then all of the derived projects had to ensure that they didn't have those files, or anything derived from them.
I think at the time this would have impacted:
Just like Net/2, this was not a complete OS onto itself, however it was the vast majority needed.
From init_main.c:
@(#)init_main.c 8.9 (Berkeley) 1/21/94
downloading
4.4 BSD Lite can still be found on the Internet...
The next and final release was 4.4 BSD Lite2