WM 6.1 has encryption called .MENC built into it
this locks the SD card so it can ONLY be read on the device that the encryption was created on.
WARNING: If the device is Hard Reset/Cold Booted, the encryption keys will be permanently deleted and cannot be retrieved to decrypt the card!
My personal experience; read before encrypting
http://forum.ppcgeeks.com/showpost.p...81&postcount=1