ISP programming and code prrotection

From: eeh (eehobbyist_at_yahoo.com.hk)
Date: 03/11/05 

Date: 10 Mar 2005 23:53:15 -0800

Hi,

I know that many products support ROM upgrade or in system programming
(ISP). However, from my brain that logically to enable this feature the
mcu should not be locked.

So I have a question that whether the above thinking is right ro not.
Or if it is right, is it possible to make ISP possible and
simultaneously protect our firmware code from being read during
verification?

Thanks!

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