The content should be encrypted as defined by the container format and
independent of the key system or the proposed extensions. For MP4, this is
defined by ISO BMFF (Common Encryption). The WebM definition is being
developed. Those individual specs should ensure that implementations of
each container are interoperable without needing to specify
container-specific information in the Encrypted Media Extensions draft.
David
On Wed, Apr 4, 2012 at 10:37 AM, Oliver Hunt oli...@apple.com wrote:
Last I saw, there hadn't been any attempt to actually define how the
content is encrypted. Has that changed? If it hasn't how do we get
interoperable implementations? The only way for this spec to not break the
openness of video and audio is for the encryption algorithm to be
completely defined in the spec.
--Oliver
On Apr 4, 2012, at 9:55 AM, David Dorwin wrote:
Hi WebKit!
I plan to add the Encrypted Media Extensions to the media elements. The
extensions allow web applications using audio and video to control key
exchange. The extensions will be behind the ENCRYPTED_MEDIA feature define.
The feature is tracked as https://bugs.webkit.org/show_bug.cgi?id=82968.
Implementation will be based on the draft proposal at
http://dvcs.w3.org/hg/html-media/raw-file/tip/encrypted-media/encrypted-media.html,
which was published jointly by Google, Microsoft, and Netflix [1]. It
appears a Media Task Force will be taking this on to produce a Working
Draft [2]. Having an implementation will allow us to include implementation
experience in the development of the draft.
As described in the proposal, several new methods and events are added to
HTMLMediaElement and a new keySystem parameter and attribute are added to
canPlayType() and HTMLSourceElement, respectively. As with much of the
media stack, most of the functionality will be implemented within the
various ports. ENCRYPTED_MEDIA will be enabled for the Chromium port and
covered by its buildbot.
Regards,
David
[1] http://lists.w3.org/Archives/Public/public-html/2012Feb/0273.html
[2] http://lists.w3.org/Archives/Public/public-html/2012Apr/0007.html
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