[rules-users] How to create new permission in Drools Guvnor

Hi, I am using Drools Guvnor. I want to know how we can create new permission that we assign to a user. Presently we have admin, Analyst, Analyst.readonly, Package.admin, Package.developer, Package.readonly. Also if i am giving package.readonly permission to User, he is able to modify the rules present in the package to which he is associated with package.readonly permission, ideally that should not happen for a readonly permission. Can u please tell me, how to assign the permission , so that user can just see the rules rather edit them. Is it possible? Thanks & Regards Pardeep Ruhil ______________________________________________________________________