navigator.requestMediaKeySystemAccess ignores session types

External Issue #7564170


Jacob T.
May 15, 2016
This issue is public.
Found in
  • Microsoft Edge
Reported by 3 people

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Steps to reproduce

When querying EME using requestMediaKeySystemAccess, it ignores the sessionTypes field. The field should specify what session types must be supported. This is useful to determine if persistent licenses are supported.

In the sample below, it queries using requestMediaKeySystemAccess and passes persistent-license in the config. It returns successful, but fails to create a session with unsupported. The query should fail to indicate that the session type is not supported.


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    Comments and activity

    • Microsoft Edge Team

      Changed Assigned To to “Ibrahim O.”

      Changed Assigned To to “Venkat K.”

      Changed Assigned To from “Venkat K.” to “Nishant N.”

      Changed Assigned To from “Nishant N.” to “Shawn P.”

      Changed Assigned To from “Shawn P.” to “Gurpreet V.”

      Changed Status to “Not reproducible”

    • Still reproducible with Edge/16.16299.

      @Gurpreet, can you be more specific when you set status to "not reproducible"? Not reproducible with which version of Edge? When can developers expect to see this fix?

    • Changed Status from “Not reproducible”

    • We can still reproduce in the latest stable.

    • I can also still reproduce with the technical preview, Edge 42.17127.1.0, EdgeHTML 17.17127.

    • Microsoft Edge Team

      Changed Status to “External”

    • This issue has been resolved External. This means this issue may require a new feature to be implemented or other work that is more significant than a typical bug. You may be able to find more information on this issue by searching for related features on and

    • What external product or feature does “external” refer to here?

    • Joey, interesting discussion about this topic at where a Microsoft rep said that the key system is supposed to be actually “” to make the CDM return appropriate response for session type persistent-license.

      And yes, judging by modifying your jsfiddle it does seem to work, see .

      Microsoft must provide a reasonable documentation for this key system, if it is supposed to supersede, in their own words, legacy “” key system for EME.

      Once the purpose of this key system is clear, Shaka Player will likely need to incorporate this key system as well.

    • Thanks, Tomas. I’ll keep an eye on that issue in dash.js, and I look forward to official documentation from Microsoft.

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