DB2 uses the operating system users and group information for its authentication and authorizatiion ...
PUBLIC - Anyone who has access to the system
SYSADM,SYSCTRL, SYSMAINT - the values of SYSADM_GROUP, SYSCTRL_GRP, SYSMAINT_GROUP dbm cfg parms ... Check the group name and go to the OS list to know the group names
DBADM - DBADMAUTH column in SYSCAT.DBAUTH . The GRANTEETYPE column specifies if it is a group or user ..
Generally all authorizations on the database objects are held in SYSCAT views which end with AUTH .. For V5,
DBAUTH
INDEXAUTH
PACKAGEAUTH
SCHEMAAUTH
TABAUTH
How DB2 works with NT security documnetation can be found in
http://www-306.ibm.com/cgi-bin/db2ww...9.htm#HDRNTSEC
HTH
Sathyaram