Novel tools and techniques for Internet service providers to enable enhanced user control over content delivery. AV data recorded on a pre-recorded tape is output from a reproducing unit of a first digital VCR with protective information indicating whether the copy of the AV data is inhibited or not. The method selects a set of sound effects clips based on the analysis of the graphical element properties. Alternatively or in addition to the above structure, the duct can have structure for resisting damage that includes providing the duct with at least one curved or faceted side along an axial length of the duct. A plurality of thin, flexible electrodes, electrical leads and conductive areas are applied to the resistive layer.