search

Dash-Industry-Forum / DRM

Collect DRM related comments
2 stars 0 forks source link

root license info delivery #7

Closed haudiobe closed 10 years ago

haudiobe commented 10 years ago

When root and leaf licenses are used for key rotation, do you see root license info delivered in-band and/or MPD? How about leaf – only in-band?

andrejp commented 10 years ago

The leaf license (not information) is in-band. Root 'info' depends on implementation could be MPD or some other way. Client might now how to get root license. DRM specific

nthorwir commented 10 years ago

Agree that this is DRM specific. I don't think that any of the standards mandates, recommends or even mentions the root/leaf concept. I believe it is OK to provide some clarification on how it can be used, but should it not be too specific.

andrejp commented 10 years ago

Shouldn't be too specific there might be DRM systems who doesn't use Root / Leaf at all. It's good to have some general description

haudiobe commented 10 years ago

Conclusion:

Leaf license is delivered only in-band. Root delivery is DRM specific – can be in-band, MPD, out-of-band. I don’t have any more questions here.

haudiobe commented 10 years ago

Add clarification: "Delivery of root and leaf licenses is also DRM specific. Typically leaf license is delivered in-band (maybe provide reason real-time, etc.), but not necessarily the case." Niels adds clarification.

nthorwir commented 10 years ago

added in 1.4.1 In the case of key rotation, if root licenses are used, the same requirement applies to the root li-censes (one per DRM), and also means all Representations shall have the same value of ‘de-fault_KID’ in their ‘tenc’ boxes in their Initialization Segments. The use of root and leaf licenses is optional and DRM specific, but lead licenses are typically delivered in band to allow real time license acquisition.

andrejp commented 10 years ago

I agreed to the clarification.