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ETSI
ETSI TS 103 205 V1.4.1 (2019
The container formats and delivery protocols above IP used for the delivery of content between a server and the Host
are out of scope of the present document, except to the extent that they influence the behaviour of the content transfer
across the CI. The provision of IP-delivered protected content by the Host to the CICAM is however designed to be
suiTable for all of the widely adopted formats at the time the present document is published.
The present document specifies support for both TS and ISOBMFF-encapsulated IP-delivered content. TS format
IP-delivered content does not require any re-encapsulation for carriage over the TS Interface. ISOBMFF [8] or
MP4FF [9] container IP-delivered content is encapsulated into a CI Plus IP-delivery specific TS-based container format
that is applied for the transfer between Host and CICAM, and back to the Host. When carrying non-TS container
content, the TS Interface is said to be operating in Sample Mode, otherwise when carrying a conventional TS it is in
Normal Mode.
In Sample Mode, DRM metadata and control information related to the IP-delivered content item being received is
passed from the Host to the CICAM via the Command Interface before playback can be started. DRM metadata that
changes between Samples is carried with the Sample data on the TS Interface.
In Sample Mode the CICAM will usually have to buffer incoming data from the Host until it is ready to decrypt
Samples. For this reason the generally applicable rule with conventional TS of constant packet delay through the
CICAM does not apply in Sample Mode.
IP delivery in Sample Mode is applicable to both single-stream and multi-stream operation, as described in clause 4.2,
with Hosts and CICAMs that are compliant with the present document.
Two IP delivery modes are foreseen in the present document, differentiated by the level of cognisance of the Host with
the IP delivery protocols and formats. They are introduced in clause 4.3.2.
Some illustrative examples of IP delivery use cases are provided in clause 4.3.3.
4.3.2 IP delivery modes
4.3.2.1 Host player mode
This mode covers a topology in which the Host is connected to a broadband network, and handles the protocols by
which the content is delivered. The Host also processes the encapsulation, or container format, for the content. The Host
passes the content to the CICAM for DRM decryption. The CICAM returns the decrypted content, which it may
re-encrypt using the CI Plus Content Control system already defined in the CI Plus V1.3 specification [3], to the Host.
The content encapsulation and transfer protocol used across the Host to CICAM interface and vice versa are specified in
clause 7.4.
This approach is analogous to the operation of Hosts and CICAMs for broadcast content, in which the CICAM provides
the proprietary protection client to decrypt the content and may deliver the decrypted content securely back to the Host
using the CI Plus Content Control system.
IP delivery Host player mode is specified in clause 7.
4.3.2.2 CICAM player mode
This mode covers a topology in which the Host is connected to a broadband network, but does not handle the protocols
above UDP or TCP by which the content is delivered, or its encapsulation formats or codecs, but instead passes the
UDP/TCP payload data to the CICAM. The CICAM interprets the encapsulation and manages the delivery protocols,
and translates them as necessary into a format supported by the Host. The content is returned from the CICAM to the
Host as a SPTS that the Host is able to consume directly.
IP delivery CICAM player mode can allow a service to use future standards for delivery and content encapsulation that
are unknown to the Host, if these are supported by the CICAM. It also allows for proprietary methods of delivery and
content encapsulation (above TCP or UDP) to be used, provided that the CICAM can translate these protocols/formats
into the interface format defined for reception of the content from the CICAM by the Host.
IP delivery CICAM player mode is specified in clause 8.