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.
Comcast is a service provider for digital voice, high speed internet, and television cable. Comcast refers to their phone service as digital voice because it does not require a phone line. Instead of the signal coming through a phone line, it is transmitted directly through a cable modem.