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my product is PDA :
it is booting via 4GB Micro sd card apart from that sd card have 2 partitions there is 1.BOOt(Uimage) @ another one is 2.Rootfs(root file sys)
My Problem is:
i want to lock the my sd card because we are giving the product is to clients on that time every one is copying the file system, so i need security means i want to give write protection to my sd card is it possibel?
If you want to protect the card from writing. Just mount it read-only.
But what i gathered from the rest of your story, you don't need write protection, but you want a form of DRM for your sd-card.
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