Whoa - that device has an HDMI-in port, which I've never seen on the market before. there are many HD frame grabbers with HDMI-in ports.
Are there any others with Linux drivers?
Your problem will be the HDCP. Of course there are devices to strip it but they may be illegal to use.
There are also HD-SDI mods for some STB's. You grab the signal before decoding. SDI-HD in cards are available relatively cheap. Better for your cpu, too. You don't have to reencode the signal.
If the captured (and stored) data is encrypted with HDCP, does it matter if it's just being retrieved later as a blob and sent to the card's HDMI out? The TV will receive the data properly HDCP encoded, right? If the intermediary step that the card introduces is just storage, and no operations on the data within the stream, then wouldn't that suffice?
What I wonder is whether that device could be used to wrap regular data inside the HDMI encoding, for a 10.2Gbps output stream between PCs (instead of a 10-Gb ethernet). One-way, and perverse, ...that tdms over rj45 crap is of course two way. Examples of usage are CEC and DDC.
You would only have point to point without switching equipment
Well, I'm talking about the inverse: 10.2Gbps (minus encapsulation overhead) arbitrary data streamed over the HDMI cable. It's not entirely useless, because ie. the PS3 has HDMI output, which is by far the fastest IO (and #2 in speed SATA has only a single port, so probably unavailable, followed by Gb-e, probably already in use, followed by demultiplexing over multiple 480Mbps USB ports, probably hard to sync...). The HDMI output might be only one way, but it's the only IO that can keep up with the Cell processor's raw speed. Not a video app, but a way to use the PS3 as a Cell data generator, maybe recrunching a large dataset prestored on harddrive against a new, smaller dataset that changes lots of values, sent as a new snapshot to a PC over "HDMI" for further manipulation at slower speeds. Quite a kluge, but a $500 PS3 (plus $225 "HDMI capture" card) would do that specific job at something like 1/10th the cost of a "real" computer, like a $7500 Cell blade workstation. And there are certainly valuable apps that work that way.