1. A method for processing an information unit/packet (IU) in a data stream processing system, comprising: enhancing security by removing one or more sub-information units from an IU, wherein said sub-information units include security and privacy labels, such that said security and privacy labels are persisted other than in the IU; and generating an index that is stored in the IU with a processor for retrieving the persisted sub information units during processing, wherein the index is added to the IU to allow for subsequent retrieval of the persisted sub-information units.