A ring oscillator in a receiver in a multimedia network is adjusted to compensate for factors that may decrease its accuracy over time using a link training signal from a transmitter device in the network. The monomers, homopolymers and copolymers for use in the method are new compositions of matter. EMM messages contain management information for entitling selected stream receiving devices to decrypt content data from the data stream using control words from ECM messages. After the metadata is restored, data associated with the filter is rebuilt based on the restored metadata. The top edges of each of the side panels include shoulders for supporting a container stacked thereon and positioning tabs that extend upwardly and fit into corresponding openings in the bottom of the upper container.