> I have had my site stolen and replicated from the
> use of this software. 

So, just go after the offending site.

> I am sure that 99% of users
> of this software are for illegal purposes.

No. 99% are legal. The remaining part is unfortunately something we can't
control.

> since the license
> agreement does not discourage this software being
> used for this purpose. 

What you do with a tool is your responsability. There are a number of built-in
protections in httrack (to limit bandwidth abuse, for example), but the use
itself can not be controlled.

See an identical thread, and their replies, here:
<http://forum.httrack.com/readmsg/12525/index.html>