"D. Schouten" wrote:
> One thing that still isn't very clear to me, is if code protected OTP
> devices
> are more difficult to read out than the newer Flash parts with code
> protect enabled.

Actually any chip can have its code memory externally read, no matter
what protection is used.  Using special microprobes is possible to read
every square micron of the silicon die, so your code is vulnerable.  Of
course, probably no one in this list have enough money to purchase such
tools, but if your code worths enough, your competitors will have the
code in the same day they put hands at your device...

This tools are available at the market, chip manufacturers use them to
run tests at their silicon wafers.

I wonder why we don't have yet some kind of electric microscanners, so
we could analyze buses and chips without physical contact... It would be
funny to see the program counter register and the internal memory bus
contents... how in the heck we will have protection for the common
saturday afternoon pirate?