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[encrypted-media] "tracked" sessions: record of usage should track session usage, not individual key usage

From: None via GitHub <sysbot+gh@w3.org>
Date: Thu, 27 Aug 2015 17:52:52 +0000
To: public-html-media@w3.org
Message-ID: <issues.opened-103561358-1440697969-sysbot+gh@w3.org>
ddorwin has just created a new issue for 
https://github.com/w3c/encrypted-media:

== "tracked" sessions: record of usage should track session usage, not
 individual key usage ==
The text from pull request #54 says "the record of key usage" contains
 an "entry for block key ID." This means that there is a record of 
usage for each key in the session. This granularity seems unnecessary 
and has costs, including:

1. Complicating the CDM, license protocol, and license server 
implementation
2. Requiring the author's server to aggregate the intervals from all 
keys to come up with the total playback period for the session

The spec generally treats sessions as a single entity, including 
closing, removing, and expiration time, and it's unclear why this 
should be different. If an author really needs different usage data, 
he or she can use multiple sessions.

See https://github.com/w3c/encrypted-media/issues/80
Received on Thursday, 27 August 2015 17:52:53 UTC

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