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Re: CfC: Create Media Task Force

From: Robert O'Callahan <robert@ocallahan.org>
Date: Thu, 12 Apr 2012 16:20:37 +1200
Message-ID: <CAOp6jLZwckRy=avUyv6FGnNXfL9FmxUqLWbr7sqXWqS-=Bsaxw@mail.gmail.com>
To: Mark Watson <watsonm@netflix.com>
Cc: Paul Cotton <Paul.Cotton@microsoft.com>, "public-html@w3.org" <public-html@w3.org>
On Wed, Apr 11, 2012 at 4:07 PM, Mark Watson <watsonm@netflix.com> wrote:

> On Apr 10, 2012, at 6:47 PM, "Robert O'Callahan" <robert@ocallahan.org>
> wrote:
> > Obviously the W3C should not bless, or be seen as blessing, a
> specification that cannot be interoperably implemented. Therefore, the
> Media TF needs to be constituted to ensure that it either produces a spec
> that can be interoperably implemented (e.g., Encrypted Media plus details
> of the CDMs that will be used and how any UA can access them), or nothing
> at all. If this condition can't be imposed from the outset, then I oppose
> creating the TF.
>

> Just for my understanding, do you mean that a detailed API should be
> defined for CDMs (in any particular language?), or that some or all CDMs
> themselves must be fully specified ? (Or something else?)
>

I think there are multiple possible ways to meet this goal for each CDM.

One way would be to have the complete workings of the CDM
documented/specified in enough detail that it can be freely reimplemented;
this would be ideal, but I don't expect it to happen, since that I assume
any CDM so documented would fail the Hollywood placebo test.

Alternatively, for a platform that offers built-in DRM API, you could
define a CDM that maps onto that API, and explain the mapping in enough
detail that any UA running on that platform could implement it.

Alternatively, for a proprietary DRM product, you could define a CDM that
maps onto that product and explain that mapping in enough detail that any
UA running where that product is present could implement it.

Thanks,
Rob
-- 
“You have heard that it was said, ‘Love your neighbor and hate your enemy.’
But I tell you, love your enemies and pray for those who persecute you,
that you may be children of your Father in heaven. ... If you love those
who love you, what reward will you get? Are not even the tax collectors
doing that? And if you greet only your own people, what are you doing more
than others?" [Matthew 5:43-47]
Received on Thursday, 12 April 2012 04:21:07 GMT

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