[linux-dvb] Re: Software CI

[Marcus Metzler <mocm@mocm.de>]

>>>>> "Pasi" == Pasi Kärkkäinen <pasik@iki.fi> writes:

    Pasi> On Sat, Apr 24, 2004 at 11:53:55AM +0000, Richard -=[]=-
    Pasi> wrote:
    >> Hi there,
    >> 
    >> It is a touchy subject, but what I am wanting to get it a
    >> budget-DVB card and have the same device node structure as an
    >> expensive card..  My logic is if (no_CI) {
    >> initialise_software_descrambler(); }
    >> 
    >> The CSA is quite easy but obviously takes CPU cycles as apposed
    >> to the hardware version. I would like to link mgcam or radegast
    >> or similar so I can use a dedicated PC as a multimedia station.
    >> 
    >> Jusding for the hesitation, is there a problem with CSA or
    >> something like that? legalities?
    >> 

    Pasi> There is software CAM/CSA available for VDR, which works
    Pasi> with budget cards without any CI/CAM hardware.

    Pasi> You can use it to view encrypted channels with your original
    Pasi> subscriptioncard, without having to buy (expensive) CAM
    Pasi> and/or CI-enabled dvb-card.

    Pasi> CSA in software seems to take a lot of cpu power.. you need
    Pasi> something like 600MHz Intel P3 only for doing CSA
    Pasi> decryption.

    Pasi> You put the subscription card to simple phoenix-interface,
    Pasi> which acts as a smartcard reader. I think it would be quite
    Pasi> easy to modify that software to use any (standard)
    Pasi> smartcard-reader..

    Pasi> I don't see anything illegal with this approach.. maybe it
    Pasi> could be supported directly in the dvb-driver level too..

There is a software patent on CSA. So implementing it will probably
cause trouble, although you may succeed in voiding the patent after a
lengthy trial.

Marcus

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| Dr. Marcus O.C. Metzler        |                                   |
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