100 includes two a filter_pid_ 1 input terminal 722 and filter_pid_ 2 input terminal 724 that are used to receive digital content streams from a program stream identifier u201c pid u201d filter 720 the pid filter 720 receives an mpeg transport stream and extracts one or more mpeg program streams to be transmitted to the av packet switch 100 the av packet switch 100 also includes a des_in_ 1 input terminal 732 and a des_in_ 2 input terminal 734 that are used to receive cooperatively manage encryption and or decryption of digital content streams from a data encryption standard u201c des u201d engine 730 the av packet switch 100 includes an av_input_ 1 input terminal 742 and an av_input_ 2 input terminal 744 that receive an av content stream e g an av content stream in the mpeg elementary stream format from an av encoder 740 the av encoder 740 can source an mpeg dv u2122 hdv u2122 dss or other av content data stream the av packet switch 100 includes a number of output terminals that are used to transmit digital content streams to external hardware such external hardware can include an av link transmit engine 705 a time stamper 715 a pid filter 725 a des engine 735 and an av decoder 745 the av link transmit engine 705 receives a digital content stream from the av packet switch 100 and.