Overlays only work on encrypted streams if and only if
display device also supports encrypted streams.
This is because NeTV never decrypts video. It has no keys internally
that are capable of decrypting anything.
Instead, it simply encrypts
the data in the overlay buffer to the
same key that the display device would be decrypting, and replaces the
pixels that correspond to the overlay with the newly encrypted pixels.
For detailed tech details, seehttp://events.ccc.de/congress/2011/Fahr ... 86.en.html
watch the video at http://www.youtube.com/watch?v=4TuwozBu1QQ
Thus, if your display or receiving device cannot handle HDCP encrypted
streams, it will not be able to understand NeTV's overlay either, as the
overlay is identically encrypted to the source stream. This is why NeTV
is not a 'stripper' -- it never decrypts video, it simply encrypts the
new data to the same keystream as the original video.
If you are trying to use a Black Magic recorder as your sink, and you're
just getting snow out of the device, NeTV won't help you. Your sink must
be a 100% HDCP-compliant device with proper decryption keys for NeTV to
work with encrypted streams.
Hope that helps.