[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:
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
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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