[Bug 784129] event: make DRM system id optional in GST_PROTECTION event

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784129

--- Comment #7 from y.bandou <bandou.yacine at gmail.com> ---
(In reply to Sebastian Dröge (slomo) from comment #6)
> (In reply to y.bandou from comment #5)
> > (In reply to Sebastian Dröge (slomo) from comment #4)
> > > Why do you want to not put the DRM system ID into the event though? You know
> > > it, so you can as well put it into the event :)
> > > 
> > 
> > As i answered to Olivier.
> > 
> > In Webm/Matroska encryption metadata don't have the DRM System ID.
> > 
> > In my case, we always choose Widevine, but I can't set it as system DRM in 
> > 
> > matroskademux, because it can be an other DRM system encryption, like
> > ClearKey.
> 
> How would a decryptor distinguish between them then, how would a decryptor
> know which DRM system is used or how could we make sure the correct
> decryptor that supports the required DRM system is used in the pipeline?
> 
> That seems like something missing in the Matroska spec

Yes I agree, I think there is a miss in the Webm spec.

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