Once the page on the client-side the browser, it's not Perl's problem. It's HTML and JavaScript problem.
You can use JavaScript to disable right click, which's breakable, however. In IE, I think it is:
function click(){
if (event.button==2){
alert("Oops, you can't do that.");
return false;
}
}
The code is different in Netscape.
You could also hide your HTML in a JavaScript file, so when view source people will see the links to the javascript files, not the content.
________________
Update: Should have mentioned the consensus that there're no solutions to the problem, only deterrent.
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