3rd Party/Developed Security Software

What software, either developed inhouse or shrinkwrapped, are Informix database product users employing with applications for security purposes? We are trying to design and implement some kind of additional security for database access that goes beyond (or even avoids the pitfalls of) object-level privileges/roles, perhaps similar to the login/password scheme that *racle uses for its SQLPlus & Server Manager shells. What have others been using? Are you using encryption? Is security even a concern?