In message  <2.2.16.19960920110620.38cf12ce@huey> PICLIST@MITVMA.MIT.EDU writes:
> >Are there any security concerns with the
> >OTP devices like the 16C57?  Or was the discussion here limited to the
> >eeprom products?
> >
> >Rob Diederichs
>
>         Well, the discussion covered a lot of quite general issues
>         related to the idea of hardware protection of software.
>
>         The eeprom chips just bring the discussion into focus by
>         being known for their ease of cracking.
>
>         The OTP parts do not suffer the particular problems of the
>         eeprom parts.
>
>         Others have, however, made the comment they believe the 'C5x
>         parts are easier to crack than the 'C8x parts!
>
>         Use your best professional judgement ;)
>

I'd like to know how the C84 and the C5x devices are cracked so that I
can use my professional judgement. My last project is expect to sell
4000 a month. I would not like the manufacturer to cut me out of the
supply loop by simply having the pics programmed elasewhere.


Anyone care to enlighten me on the tricks that are used?


Regards,



Mike