R.2 SDP Signalling

26.2343GPPProtocols and codecsRelease 17Transparent end-to-end Packet-switched Streaming Service (PSS)TS

SDP signalling of protected PSS streams shall be done as described in section 8 of [102].

NOTE: the mentioned section describes how to signal crypto suite (please note the corresponding remark in clause R.1.3.1), IV length, key indicator length suite (please note the corresponding remark in clause R.1.3.2), selective encryption, salt key suite (please note the corresponding remark in clause R.1.3.1), key management system, key, delta IV length, and key indicator per AU, using fmtp attributes. The signalling of key management system allows associating the protected PSS streams with a DRM system, and thus enables the PSS player to contact the DRM agent, in order to handle stream decryption.

Additionally, DRM system specific parameters may be signalled in the SDP, but are out of scope for the normative part of this Annex (they are some example protection systems discussed in clause R.4). If a PSS client does not understand such parameters, it should ignore them.

If key streams using STKM stream format are used, SDP signalling of key streams shall be done as specified in sections 10.1.2 and 10.1.3 of [103], with the following restrictions:

– streamid parameter shall be included for SDP signalling of key streams; all other parameters mentioned in 10.1.2 of [103] are optional

– stkmstream parameter (section 10.1.3 of [103]) shall be included for SDP signalling of media streams and be used to link media streams and STKM streams