Apparatus, systems and methods for accessing CAS protected content

A broadcast receiving apparatus comprises: a broadcast stream receiver, extracting Conditional Access System CAS data from the received broadcast stream, the CAS data comprising data for accessing CAS protected content in the stream; a communication unit to retrieve a content access key associated with the extracted CM data from a server; a control word generator to generate a control word (CW) for descrambling the CAS protected content, based on the retrieved content access key; and a descrambling unit to descramble the CAS protected content using the generated control word. The receiver may obtain an identifier (ID) from the received stream, and identify the server for retrieving the key depending on the ID; the ID may comprise a conditional access (CA) system identifier, CAS ID, identifying one of plural conditional access systems. Alternatively, the obtained ID comprises a broadcast service identifier for one of plural multiplexed services in the stream. Uniform resource locators (URLs) may be associated with identifiers. A broadcast providing apparatus, transmitting a broadcast stream including CAS protected content and generated CAS data, is also disclosed.