Commercial speech, however, is less protected by the First Amendment than political speech, and is therefore subject to greater regulation. The Free Press Clause protects publication of information and opinions, and applies to a wide variety of media.
In computer networking, multicast (one-to-many or many-to-many distribution) is group communication where information is addressed to a group of destination computers simultaneously.
IP Multicasting Overview. The concept of group membership is central to IP multicasting. IP multicast datagrams are sent to a group, and only members of the group receive the datagrams.