Section: W.4.2 Protection of the traffic transmission
Content: The traffic may require some protection depending on the sensitivity of the data being transmitted. For example, it is possible that the data being transmitted is actually protected by the application layer security and hence might not require additional protection. However, the protection in service layer is independent of application layer security. The service protection description in the Service Announcement implies the protection requirement of the traffic transmission in case the security protection is provided in service layer. It may include indications for which security procedures are supported by the network: control-plane procedure or user-plane procedure. If the support for user-plane procedure is indicated then the description should include also an indication of whether GBA or/and AKMA is supported. NOTE: If the security protection in service layer is not required, the service protection description is not present in the Service Announcement. If the UE does not support the network selected MBS security procedure at the service layer, then the UE may obtain the service via individual delivery method. The actual method of protection may vary depending on the type of data being transmitted, e.g. media streaming application or file download. Clause 6.6.2 and clause 6.6.3 in TS 33.246[ 3G Security; Security of Multimedia Broadcast/Multicast Service (MBMS) ]  [102] apply to the protection of streaming data and protection of download data, respectively.