In a downloadable conditional access system, preferably all DCAS-specific code is implemented in a configurable secure processor that is in communication with the host processor. The method involves the generation of an encrypted activation key which is produced in response to the network address address) of the electronic device to which the download is directed. The bulk C&D debris is sorted into at least a first portion for further processing, and a second portion that is set aside. The porous carrier may form a rod-shaped protruding portion around the catalyst metal particle.