Oh, also see this...
http://electronics.stackexchange.com/questions/5628/do-i-need-to-pay-royalt=
ies-to-the-sd-card-people-if-my-device-just-happens-to


On 6/21/2012 11:10 PM, Neil wrote:
> On 6/21/2012 6:00 PM, Lyle Hazelwood wrote:
>>> ...
>>>
>>> Presumably R/E is allowed so does one also have to buy a license in ord=
er
>>> to use 4 bit mode?
>>> Of for that matter SPI mode?
>>>
>>> R
>
>    From what I've seen in recent research, it's apparently more than just
> paying to get the standard, but also royalties for making/selling any
> device that interfaces to SD cards using anything other than the SPI
> interface.  See also
> http://en.wikipedia.org/wiki/SD_card#Openness_of_the_standard

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