A method and system for authorising multiple devices (56) and multiple content providers (52) in a content provision system is provided. Each content provider is issued with a content provider authorisation certificate. Each user device is issued with a user device authorisation certificate, the two certificates for coming from a common source. A determination is then made as to whether each content provider and each user device is authorised to participate in the content provision system via a mutual exchange and comparison of the certificates between respective content providers and user devices.
