[linux-dvb] Re: Nova + PC Card(pcmcia) driver--is it possible to watch encrypted program by using these devices?

["Christian Limpach" <chris@Pin.LU>]

> >  Are you sure about that? AFAIK the CAM (the PCMCIA card) only returns
the
> > actual descrambler key (using informations found in the TS and in your
> > valid subscription card ofcoz'). You still need to descramble the
> > encrypted channel using this key (this is done outside the CAM - e.g. in
> > the AV711x on the rev1.3 card). And the algorithm you need here is
> > something you probably never can get... so the nova card + PCMCIA card
> > reader combination still misses an entity (the descrambler).
>
> No, you are wrong . The CAM contains a transport stream interface, to get
> the encrypted stream and return the decrypted stream. Please read the EN
> 50221 standard freely available at www.etsi.org .


Then either the standard is wrong or you misread it since this seems not to
be the case.  At least the software CI/CAM only sends the descrambler keys
to the DVB card and only needs the ECM PES as input, it never sees the
actual encrypted/decrypted data.  I don't know which part of the DVB card
does the descrambling, but there seems to be some relation between the
descrambler and the streams setup to be demuxed as DMX_PES_VIDEO/AUDIO on a
full card.

I don't know if the Nova card has the descrambler hardware.  Since there's a
Nova card with a CI interface now, at least this card should have the
descrambler.  I don't know if that card supports feeding keys to the
descrambler through the driver (current or at all).

     christian




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