PC/DACS 2.1 for OS/2
Released in 1995 by Mergent International, Inc
For OS/2

PC/DACS is a system utility that adds password protected access 
control to a computer. It support session timeout, usage time 
restrictions, boot protection, system drive encryption, and GUI tools 
for all administrative tasks.

The product was available for DOS and OS/2. The two are compatible,
and can be used to dual-boot while keeping both OSes secure.
