Have you tried db2iauto ? According to the manual :
db2iauto - Auto-start Instance Command
Enables or disables the auto-start of an instance after each system
restart. This command is available on UNIX-based systems only.
check the syntax here
http://publib.boulder.ibm.com/infoce.../v8//index.jsp , search
for "db2iauto"
and answer on your second question , no license is applied once ....

/RK