This is a two-part problem:
- being able to capture a hidef stream
- making this ability useful with any modern broadcast system
The first is technical since the bitrade is huge.
It used to be available only in pro equipment carrying pro-level pricing. Not anymore (see above).
The second is philisophical/moral.
HDCP is probably the weakest "protection" system devised recently.
Without going too deep into how it can be circumvented, just have a look at this
Spatz-Tech's DVIMAGIC: killing on HDCP - Engadget
It's more proof of concept: expensive, hard to get, doesn't work with all devices, etc.
Also remember that the HDCP key can be revoked as any AACS and/or BD+ key (the Spatz device has an HDCP key!).
And we haven't even scratched the surface of the main problem - how to handle the captured stream in real time...
Ripping regular DVDs is easy but is done by very few.
Ripping HD/BD is hard, has no certain future and is done by hobbists only...
Handling HDMI capture is 10 times harder, more expensive (RAID5), requires more computer experience and will never go mainstream.
Diogen.