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[Bug 16553] Consider not firing a needkey event when a potentially encrypted stream is encountered if the key is already known

From: <bugzilla@jessica.w3.org>
Date: Thu, 01 Nov 2012 00:51:49 +0000
To: public-html-bugzilla@w3.org
Message-ID: <bug-16553-2486-9NvDFerriT@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=16553

--- Comment #8 from David Dorwin <ddorwin@google.com> ---
It appears we are already doing what this bug originally suggested and have
been doing it since the original draft. Step 5 of
http://dvcs.w3.org/hg/html-media/raw-file/tip/encrypted-media/encrypted-media.html#algorithms-encrypted-stream
uses the "cdm to determine whether the key is known" and skips firing the event
if the key is known.

However, it's unclear whether this is possible with all containers and what to
do if initData represents more than one key. As an example of the first issue,
the ISO PSSH does not necessarily identify all keys that might be obtained
using it.

So, it seems we need to decide whether to remove the existing text rather than
adding text as suggested by the title.

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