Multipoint Distribution Service (MDS) is defined as a medium of mass communications. It may be licensed as a common carrier where non-affiliated programmers, usually pursuant to a Tariff on File with FCC, lease time from the MDS licensee to "air" its programming. Alternatively, a licensee may choose to operate as a non-common carrier and program its own facility of lease Transmission time to an affiliated program-mer without the requirement of filing a tariff. Unlike conventional broadcast stations whose transmissions are received universally, MDS programming is designed to Reach only those who have opted to sub-scribe to the service.