scope:

In order to minimize unexpected risks and to maximize the survivability of media services, trust can be used to evaluate and verify that entities involved in media services are working in expected ways. Trust-based media services aim to restrain untrustworthy users from behaving maliciously, as well as being robust to unexpected executions and failures with a certain level of predictability and reliability. Thus, this Recommendation provides a framework for trust-based media services.The scope of this Recommendation includes:

- identifying risks of media services and the necessity of trust-based media services;

- functional requirements for trust-based media services;

- components and a functional architecture for trust-based media services;

- trust analysis mechanism, trust-based content consumption and sharing services.

Detailed use cases for trust-based media services are described in Appendix I and calculating trust index is described in Appendix II.