The present invention relates to a multi-component composite separate membrane and a method for preparing the same, and to a multi-component composite membrane comprising a support layer and active layers, wherein the support layer is located between the active layers. In accordance with the method, management information comprising encryption indication information indicating that user data stored in an associated sector of a record carrier, such as a recordable optical disk, is to be encrypted by a read-out device before being transmitted over a communication bus. In another aspect, there is disclosed a high temperature composite insulation assembly for a fuel cell that includes a core portion having inner and outer surfaces, and a reinforcing material disposed on the outer surface of the core portion.