POWERKEY

computer hardware, namely, microprocessors and application specific integrated circuits, and software operating on the microprocessors, all for use in decrypting, encrypting, providing digital signature and authentication of digital and analog, data, audio and video signals, and all for use in providing conditional access of an MPEG-2 transport stream; digital home communications terminals, namely, computer hardware therein to provide conditional access; headend and central office hardware equipment, namely, multiplexers, decryption hardware and encryption hardware; network control and management software for use in controlling the computer hardware, headend and central office hardware equipment