i have a script that resizes images to a thumbnail, and i dont want people to find it, like it and use it on their site. Is there a way that i can make it so they cant use it on other sites?

or maybe make it so that it is hidden. here is how i call the script:

PHP Code:
<img src="http://www.mysite.tld/includes/image_resize.php?http://www.mysite.tld/IMAGE.png">