[linux-dvb] Re: Kernel OOPS

[Oliver Endriss <o.endriss@gmx.de>]

On Tuesday 09 March 2004 01:15, Robert Schlabbach wrote:
> From: "Oliver Endriss" <o.endriss@gmx.de>
> > Hm, interesting. Are you sure? Afaik the CSA is implemented in the AV7110
> > of the full-featured cards. So I would have expected that CSA has to be
> > implemented in the driver of the budget cards, not in the CAM.
> > Maybe I'm wrong.
> 
> These are two different things. Remember that some receivers only come with
> a smart card slot, i.e. they have a "builtin CAM". In those, the firmware
> implements the algorithm which generates the key pairs (64 bits = 8 bytes),
> with which the MPEG-2 transport stream is decrypted using CSA. The firmware
> could then write this key pair to the corresponding AV7110 registers and
> have it decrypt the transport stream _without_ any CAM!

I see. That's why they called the av7110 'Integrated Set-top Box Decoder'.
It was designed for stand-alone set-top boxes...

> But when you have a CAM, it will implement the CSA.

Great. So there are no license/patent issues which might prevent writing
an open-source driver. I wonder why nobody has done this before.
The hardware has been available for some time.

Oliver


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