> HTTrack is being used to copy my websites illegally
> - websites over which I have a clear ownership of
> all intellectual property.

As already advised here:
<http://www.httrack.com/html/abuse.html#WEBMASTERS>

And just a small hint: take a look at the copied site html page sources
(especially the inlined comment at the begining). This may help you if you
want to get some (clear) evidences.