[GTALUG] little Android set-top boxes with HDMI in

D. Hugh Redelmeier hugh at mimosa.com
Thu Jan 28 14:39:26 UTC 2016

| From: ted leslie <ted.leslie at gmail.com>

| I wonder how DRM works on the hdmi in? that stuff is all at a chip level
| now, not in software?

HDMI DRM is done through HDCP standards.  These have always been done
in hardware.  And they have been done in a way to make it hard to tap
into a clear signal (at least that has been the intention).


	HDCP uses three systems:[5]

	1)	Authentication prevents non-licensed devices from receiving content.

	2)	Encryption of the data sent over DisplayPort, DVI, HDMI, GVIF, or
		UDI interfaces prevents eavesdropping of information and
		man-in-the-middle attacks.

	3)	Key revocation prevents devices that have been compromised and
		cloned from receiving data.

Steps 1 and 3 probably use a processor on the HDMI chipset

I'm 99.999% sure that the HDMI input on this box does not support
HDCP.  So you won't be able to record from your DVD player or your
Rogers set-top-box or your Bell STB.

You probably can record from your OTA boxes (but it is better to
record from an ATSC source -- more compressed).  You might be able to
record gameplay on consoles.

| [This isn't to say anyone should ever defeat drm for use to make a illegal
| copy, I was just interested in
| the technology. ]

Get too interested and talk about it in a way that could be used and
you will be a criminal.  Part of the anti-circumvention measures in
the Copyright Act revisions passed by the Harper Government a couple
of years ago.
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