1. A system for delegating a privilege and associated attributes from a security token to at least a first data processing unit, said privilege enabling access to at least one resource by said at least a first data processing unit subject to requirements prescribed in said associated attributes comprising: i. said security token including said privilege and said associated attributes and delegation means for delegating said privilege to said at least a first data processing unit, ii. said at least a first data processing unit including privilege processing means for implementing said privilege in accordance with said requirements prescribed in said associated attributes, iii. communications means for performing data exchanges between said security token and said at least a first data processing unit.