We propose a new classification using two criteria: the multimedia
traffic that exercises the control and whether the
scheme is scalable or not. Thus, we get three classes: service
control, user control, and flow control. Each class is further
classified into scalable and non-scalable schemes. In the context
of IoT key management, scalability refers to the ability to
provide a larger group of multimedia contents without any
prior knowledge. A scalable scheme is able to manage a large
group over a wide area with highly dynamic sensors. If the
computation and communication traffic at the sources increase
dramatically with the size of the group, the scheme is treated
as non-scalable.