[Bug 21869] Need clarity on stored keys for CDMs

https://www.w3.org/Bugs/Public/show_bug.cgi?id=21869

--- Comment #2 from Joe Steele <steele@adobe.com> ---
Retaining some keys allow for better performance and usability. Every key
acquisition has a cost, both to the user (representing either user time spent
or delay to first playback) and to the server operator (key retrieval on the
back end).

Some keys may be required again and again - for example if a group of devices
is associated with the same account, a common key can be used to request
content licenses for those devices. 

Some keys may only be required for a particular piece of content, but you don't
want to have to pay the cost of acquisition again just because you have put
your machine to sleep briefly. 

And in some cases it may not be convenient to reacquire the key, for example if
the key can only be acquired in a private environment but the content is
available to key holders in public environments.

Also there may be metadata about the keys themselves which needs to be
retained, for example how many times this piece of content has been played,
when the first playback started, etc. This can be maintained on the server, but
there can be a cost benefit to users and content providers to have this local.

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Received on Monday, 13 May 2013 20:46:15 UTC