s Network control and Intelligence Bandwidth Access Access Core connectivity connectivity connectivity Figure 5.5 Hundreds of services are grouped into a number of segments, with defined require- ments on the network and terminals Services Explain what a service plan is and the criteria for service selection. Understand service QoS and related network requirements. Describe three methods to decrease service bandwidth needs. Understand the relation between service requirements and design of various network parts. 5.1.3 TERMINOLOGY The service area is dynamic. Today we talk about multimedia services, web services, posi- tioning services, video services and SO on, proving that 'services' can have many different flavours. Other important terms are media stream and digital rights management (DRM). What is DRM? DRM poses one of the greatest challenges for content communities in this digital age. A main reason is that digital files can be easily copied and transmitted, breaking copy- right law. DRM covers the description, identification, trading, protection, monitoring and tracking of all forms of rights usages. Since content is a key to success for the integration between the telecom and the media industries, a solution is crucial. What is a Media Stream? See Chapter 1, terminology. What is Multimedia? Multimedia is a key target for ongoing development. Multimedia is any combination of voice, video and data, used to enhance the end-user experience to something above traditional telephony. It can include both conversational and streaming services (explained below). Multimedia can be described as a combination of two or more media elements syn- chronized in time and/or context. 'Conversational multimedia' is a subset of multimedia, offering real-time, multidirectional communication between two or more parties, using multiple media concurrently. Multimedia services that are combined with non-media related applications, such as directory information or location, can be referred to as 'combinational services'. Multimedia se