Nope. Following the robots.txt file is optional for a spider. So if someone's automatially stealing content, their robot almost definitely won't read your robots.txt.
Thanks for response ... Learnt since that it needs to be in the .htaccess file. Now i just need to learn what goes into it!!
Try something like: order allow,deny deny from [leacher1 IP address] deny from [leacher2 IP address] allow from all