Hi guys. ;-)

Up to me the better way to protect some device is good marketing tactics
and low prices with good support. ;-) Otherwise somebody who not so lazy
will offer something better and all those protections will be hopeless.
Two steps ahead anyone, I guess it's good protection ;-)

WBR Dmitry.

Graeme Smith wrote:
>
> Hmmm....
>
> How about setting up a "Chip Protecter" linked to a pic pin that is only
> used to "Read" the chip. this "Chip Protecter" blows when they try to read
> the chip, thus turning off the oscillator, and shutting down the pic.
>
> They can read the chip, but they can't use the same circuit to test it....
>
> (Unless they replace the chip protecter).
>
> another possible approach, is to set up a circuit so that no matter how
> the chip is reprogrammed, unless it gets a certain voltage on one of the
> pins, it will automagically shut down... can be set up so that it checks
> the chip-id to make sure it is on the same chip, or to a timer so that it
> will run for about 20 minutes, and then shut down permanently. (blow a
> chip protect fuse?)
>
> Of course mis-using this to do planned obsolescence is considered bad
> design... isn't it?
>
>                                 Grey
>
> GRAEME SMITH                         email: grysmith@freenet.edmonton.ab.ca
> YMCA Edmonton
>
> Address has changed with little warning!
> (I moved across the hall! :) )
>
> Email will remain constant... at least for now.