Hello Prahlad,

"DS2411"

I suggested a similar idea in a previous thread:

http://www.8052.com/forum/read.phtml?id=90608

From your above discussions, I infer that you sell programmed microcontrollers to your customers who in turn manufacture the product, if this is the case why dont you just sign on the micro or below the micro with ohp(indeliable) pen, this is what the computer hardware vendors do over here, if you purchase a hard disk or a interface board they will sign on them or the ICs usually with gold or silver coloured pens.

To avail warranty on these products this signature must be intact.

Regards,
John.