AUSAM, the Australian Unix Share Accounting Method, was a modified version of Sixth Edition Unix done at the Universities of Sydney and New South Wales. The system had major improvements in security, performance under high load (i.e. many users) and process accounting.
Many of the changes in AUSAM (look for the "fix nnn" comments in the kernel code) were fed back to Bell Laboratories and were merged into Seventh Edition Unix. Some of these changes were still present in the early versions of System V.
The files here come from the UNSW 04 tape, donated by the University of New South Wales. The sys106/ directory holds a slightly later version of the AUSAM kernel, and it comes from the UNSW 106 tape.