[Bug 17673] Define Initialization Data for implementations that choose to support the ISO Base Media File Format

https://www.w3.org/Bugs/Public/show_bug.cgi?id=17673

--- Comment #61 from Jerry Smith <jdsmith@microsoft.com> ---
Regarding multiple SystemIDs in ‘pssh’ box:  That is not specified and there is
no discussion of that possibility in CENC 2nd Edition.  There may be multiple
‘pssh’ boxes in a file, but each has only one SystemID to indicate one DRM
system.

I added the other instances for 'pssh' (in the moof and in XML) as further
reference information on where initData of that type may be encountered.  I do
believe the moof example may be for key rotation, but it's not specifically an
endorsement of that approach.

I don't fully understand the concern about 4):
> 4) "The application may parse out 'pssh' boxes which do not correspond to
> the selected key system, and may not use the InitData from the file at all
> and instead use initData from another source (e.g. the XML element described
> above).
The second segment is intended also as reference information to facilitate use
of CENC content.

CENC 2nd Edition is still under ballot in ISO/MPEG, so not publicly available. 
The Draft International Standard (DIS) ballot has been completed and comments
resolved in a Study document.  Final and formal resolution of comments will
happen at the next MPEG meeting in July, and any edits to the Study document
sent for Final Draft International Standard (FDIS) two month ISO approval
ballot.

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Received on Monday, 16 June 2014 19:26:53 UTC