[linux-dvb] dvb-s encryption - how to capture a stream

MikeW mw_phil at yahoo.co.uk
Fri Nov 9 14:14:52 CET 2007

Patrick Bulteel <linuxtv <at> bulteel.org> writes:

> Hi,
> I have a dvb-s card with a CAM and my subscription card.
 I get the message in
> syslog that shows the CAM is detected and initialized.
 However... I'm not sure
> how to get the encrypted video. Since it's a DVB-S card
 I thought szap would
> work, but although I "get" something, I can't view it,
 probably because it's the
> encrypted stream.
> What tool would I use? I have seem mention of ca_zap
 or something similar, but,
> I can't find the binary or source anywhere. Any pointers
 would be appreciated. 
> Also would it be possible to decrypt an entire mux if
 I have a subscription for
> all the channels in the mux? 
> --
> Patrick Bulteel

Reading the "do drivers support Nagravision CA" post suggests that
your CAM + subscription card combination needs to be registered in some way
with the broadcaster, so that the appropriate 'entitlement message'
can be sent out over the data stream to allow the card to generate
the decryption code word sequence for the streams you have subscribed to.

Depends on the broadcaster's encoding whether decryption would work
across a mux.


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