Here's some more info on the MS & SD card security:
I don't know how well known this is (I didn't know it, but neither had I looked
) -- the Sony Memory Stick Pro supports card based security similar to the SD card (not the same security, but rather the same general concept). Sony uses something called MagicGate according to this article
Note that the Sony Reader uses Memory Stick and SD cards, not Memory Stick Pro
and SD cards (the security isn't available in the non-Pro MS). This indicates that Sony hasn't implimented the the card based security for their own
memory type, so I think we can safely conclude that they didn't implement it for the SD cards either -- why do somebody else's if you're not going to do your own?
As an aside, if I'm interpreting this
correctly, Sony has actually "opened" the MagicGate standard for use by others.