[Bug 21104] Distinguish between CDMs that allow the users to have digital access to the decrypted or decoded data versus those that do not.

https://www.w3.org/Bugs/Public/show_bug.cgi?id=21104

--- Comment #5 from Glenn Adams <glenn@skynav.com> ---
(In reply to comment #4)
> (In reply to comment #1)
> > Adding definitions that are not referenced serve no purpose. What is the
> > technical purpose of making this distinction?
> 
> Text that references these definitions needs to be added to the EME
> specification, and we need the definitions to be able to discuss
> bugs that are working towards text changes.

If there is no API exposed distinction, then there is no need to reference such
definitions.

In particular, it is not necessary for EME to refer to possible ranges of use
cases in order to define its functionality or semantics.

It is true that in some cases, W3C specs have first created an informative
document that outlines use cases and or requirements, and then made informative
reference to this document from a technical definition document (like EME);
however, this is not a process requirement.

> 
> > In particular, what EME
> > defined API or function operates (when viewed from the outside of the CDM
> > black box) when using a CDM that is designated as a SCDM or as a DRM-CDM? If
> > there is no externally visible technical difference (from the API
> > perspective), then there seems to be little utility in making this
> > distinction.
> 
> The two case are very distinct and the implications are wider
> than just the API, but even considering just the API there
> are significant differences.  For example, for a SCDM the
> web browser will have a 'save as' option to store the
> decrypted content, and the user will be able to view
> the saved content in future without a license server so much
> of the EME infrastructure is not needed and could be
> disabled for security and privacy reasons when a SCDM is
> used.

Providing a "save as" or capture option is outside the scope of EME. It is
clearly possible to have such a feature in a given CDM, but that would be part
of a specific CDM's internal semantics. It is better to defer such discussion
and functionality to either the Media Capture activity of the WebRTC WG or
Media Download and Recording task force of the Web and TV IG.

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Received on Monday, 25 February 2013 15:15:42 UTC