linux-kernel - Re: Testing of CPRM on SD Card

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Date:	Mon, 30 Jul 2007 20:23:42 +0530
From:	"Midhun A" <midhunagni@...il.com>
To:	"Alan Cox" <alan@...rguk.ukuu.org.uk>
Cc:	"Sriram, Kannan" <ksriram@...com>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-mtd@...ts.infradead.org
Subject: Re: Testing of CPRM on SD Card

Hey All,

    Thanks a lot for the replies. I have the development keys. But the
algorithm and some intellectual property needs to be licenced from the
4C entity guys to implement it. As of now I just want to test the CPRM
functionality. So licensing the algo for a prototype testing is a huge
cost.

   That is why I was looking for an already implemented solution -
hardware/software - so that I can just test. If it does not suite our
needs, then I have just paid for a chip only and not for a whole
license.

  Seems like there is no other way out than shelling out money for the
license. :(

Thanks anyways,
Midhun.



On 7/30/07, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> On Mon, 30 Jul 2007 11:20:58 +0530
> "Sriram, Kannan" <ksriram@...com> wrote:
>
> >
> > Midhun,
> >
> >  There is no open-source implementation of CPRM (SD-Audio/ SD-Bind
> > standards). So first of all, you need to license keys from 4C (device
> > keys, media keys etc) and do your own implementation.
>
> Also remember that if you do your own implementation in the kernel you
> will be required to publish the source code under the GPL and that will
> not be permitted with the CPRM licensing. Thus you will need to do all
> the work in user space.
>
>
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