The present disclosure relates generally to audio and video processing. One claim recites a portable apparatus comprising: electronic memory comprising one or more identifiers, each of the identifiers being associated with previously accessed audio or video items, with each previously accessed audio or video item including an identifier associated therewith; and a logic processor programmed for: a. restricting access to an encountered audio or video item if an identifier associated with the encountered audio or video item is one of the one or more identifiers associated with the previously accessed audio or video items, and b. limiting a number of content items with different user identifiers that can be accessed in a predetermined amount of time. Other claims and combinations are provided as well.