Answer by Matt Young · Sep 22, 2015 at 03:47 AM
Widevine would like to reinforce our recommendation of using separate content keys to encrypt each video and audio track. In particular, the emphasis is on using separate content keys for each SD, HD, UHD and Audio stream.
Hi @Matt Young,
In sentence "you could filter on the source stream name in onHTTPMPEGDashEncryptionKeyVODChunk api event handler and provide the corresponding key by it", by "source stream name", do you mean the published stream name, like "myStream.smil", or the source streams for each bitrate, like "myStream_720p"?
If it's "myStream_720p", that means we can still apply different keys for different bitrates, and therefore apply different keys for different tracks. Is this understanding correct?
Thanks,
Wendong
Answer by Andy Engberson · Sep 09, 2016 at 12:56 AM
Answer by Wendong Li · Apr 17, 2017 at 09:21 AM
As mentioned by @Alexey R, using different encryption keys for SD and HD bitrate variants is a strong recommendation from Widevine. This recommendation comes from the concerns from the content provider on the security of the HD content.
If this is currently not achievable in Wowza streaming engine, for service providers with HD contents, it is a blocking issue, and it will be helpful if you can share the plan on adding this support.
Thanks,
Answer by Wendong Li · Apr 19, 2017 at 07:09 AM
By testing, we confirmed that callback
onHTTPMPEGDashEncryptionKeyLiveChunk
comes once per bitrate source (for each chunk), and by checking parameter "streamName" in the callback we can differentiate different bitrates and apply different keys. This also works for audio if you use a separate source for audio.
However, this doesn't work for VOD as callback
onHTTPMPEGDashEncryptionKeyVODChunk
comes only once (for each chunk), and there doesn't seem to be a way to apply different keys.
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