[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 #20 from Steven Robertson <strobe@google.com> ---
A device manufacturer can put a newer browser on a device with an older
implementation of a protection system, and that older protection system might
require something beyond key ID and URL. For instance, older versions of
PlayReady require a checksum of the content key to be present in the
initialization data in order to generate a challenge.

It may be argued that every protection scheme going forward should restrict
itself to not requiring any kind of extra initialization data. Such an
argument, if followed, would exclude many devices, leaving only new, high-end
devices with platform support for newer CDM implementations. Due to long CE
manufacturing timelines, devices with older CDMs will continue to be produced
for some time, and so such a position could leave many users out in the cold.

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Received on Saturday, 17 August 2013 04:01:20 UTC