I don't know if this info is specific to the ts-7400 but here goes:
http://www.embeddedarm.com/Manuals/ts-7400-info.txt , Section "SD
flash card security features"
Coming up with self-made solutions like doing checksums on startup
seem to be easy to override: if they are able to put new stuff on the
card they're likely to be able to remove some as well, including
those startup checks.
I haven't put much thought into this but it may be quite attractive
to "lock" the card to the board and have a means to password-protect
write-access to the card.
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