1289623 - [EME] Assume keys marked as "output-restricted" are usable

Status: RESOLVED FIXED

(Core :: Audio/Video: Playback, defect)

Description

[Chris Pearce [:cpearce (Not reading bugmail)]]

Chrome appears to assume that keys marked as "output-restricted" can be used to decode samples. The Widevine CDM also decodes samples using keys marked as "output-restricted". So we should change Firefox to send samples to the Widevine CDM for keys that are marked as "output-restricted".

Once we do this, Netflix works on Linux with Widevine if you spoof your useragent to Chrome. :D

Comment 1

[Chris Pearce [:cpearce (Not reading bugmail)]]

Attachment: Bug 1289623 - Assume keys marked as 'output-restricted' are usable.

Chrome appears to do this.

Review commit: https://reviewboard.mozilla.org/r/67296/diff/#index_header
See other reviews: https://reviewboard.mozilla.org/r/67296/

Comment 2

[Gerald Squelart (he/him) (not at Mozilla since 2022-09-15)]

Comment on attachment 8774943 [details]
Bug 1289623 - Assume keys marked as 'output-restricted' are usable.

https://reviewboard.mozilla.org/r/67296/#review64314

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/a19ed4379b60
Assume keys marked as 'output-restricted' are usable. r=gerald

Comment 4

[Carsten Book [:Tomcat]]

https://hg.mozilla.org/mozilla-central/rev/a19ed4379b60

Comment 5

[Chris Pearce [:cpearce (Not reading bugmail)]]

Comment on attachment 8774943 [details]
Bug 1289623 - Assume keys marked as 'output-restricted' are usable.

Approval Request Comment
[Feature/regressing bug #]: Widevine EME on Linux
[User impact if declined]: Widevine EME on Linux won't be able to playback Netflix content.
[Describe test coverage new/current, TreeHerder]: We have plenty of EME mochitests, which run on Linux.
[Risks and why]: Low; this is a small change that just makes what we consider a "usable DRM key" more permissive.
[String/UUID change made/needed]: None

Comment 6

[Liz Henry (:lizzard) (relman/hg->git project)]

Comment on attachment 8774943 [details]
Bug 1289623 - Assume keys marked as 'output-restricted' are usable.

More work for Widevine support, OK for beta uplift.

Comment 7

[Chris Pearce [:cpearce (Not reading bugmail)]]

https://hg.mozilla.org/releases/mozilla-beta/rev/d47e7a99aa82

Comment 8

[Chris Pearce [:cpearce (Not reading bugmail)]]

https://hg.mozilla.org/releases/mozilla-beta/rev/d47e7a99aa82