A digital downloading jukebox system including a mechanism for delivering custom services to a recognized user is provided. Each noise block is preferably subjected to a fade function with another noise block over the plurality of respective video frames to make the embedded watermark resistant to changes in data frame rate or other temporal distortions in the frames of data. An associating data that associates the first set of backed up data blocks with the one or more other sets of backed up data blocks is stored. The regulator can be used to adjust a regulated signal at the second terminal according to the supply signal.