Multi-Key Encryption

[technogeek00]

Use Case Description

A single media experience where multiple encryption keys are utilized to provide access to varying levels of experience quality depending on the device / environment security level.

Working Notes

• This differs from key rotation in that key rotation is concerned with the change of key across a single CMAF track while multi-key encryption is concerned with the use of different keys across CMAF aligned switching sets
• Issue surfaced based on 6th Edition of MPEG DASH providing multi-key encryption examples

Open Questions

• How much about the security requirements of keys are tied into signaling interoperability?
• Are there industry best practices relative to multi-key encryption?

[technogeek00]

Net questionnaire score: 10

Question	Answer
Does the feature relate to an industry streaming use-case?	Yes, Content Security
- What is the commonality of this case?	Very Common
- Is this an established or emerging practice?	Emerging
Does this feature have related mechanisms in both DASH and HLS?	Yes
- What is the maturity of support in both specifications?	HLS - Mature , DASH - Mature
- What is the maturity of implementation support for both specifications?	HLS - Immature, DASH - Immature
- Are there known interoperability issues between specs?	Potentially
- Has anyone implemented this interoperably?	Yes
- Are there features missing in a specification with open proposals for it?	Unknown, needs investigation
Has the industry defined defacto mechanisms not present in both DASH and/or HLS?	No
- Why was functionality defined outside of the main specifications?	N/A
- Has the functionality been standardized elsewhere (DASH-IF, CTA, SVA)?	N/A
- Is the functionality proprietary or openly developed?	N/A
- Could the functionality be incorporated into specifications with evangelism?	N/A