> Hardware coupling is obviously not a problem in a smartphone (unlike HDMI).
I think that is a poor assumption to make. How many PowerVR video devices are used in set-top boxes, televisions, and other devices? I don't know the answer, but it's certainly a large number of devices.
Plus there are phones that do actually have HDMI output, many of those that do are Android devices.
Unfortunately there is plenty of DRM in cell-phone and ARM-style devices.
> encrypted / obfuscated
Yeah. DRM implies Obfuscation really only. Encryption is usually used as part of the process because it's very effective in terms of protection during transport, but it's useless as a mechanism on the actual end user's device itself. So DRM depends entirely on obfuscation to work properly.
DRM is much less of a issue now then it's been in the past, but the effects of it is going to linger on for some years.