The people who are going to steal it are not too concerned if they are doing something illegal.It was very easy to get  even without Image Ready.
I find my images on peoples blogs, on other galleries but I gave up concerning myself.
 If you have a website and good stats you can find out who is  viewing them and have a visit from their location in many cases.
Best thing is if it bothers you, don't post any images you don't want  others to get. You can always take it as a compliment.

"The happiness of a man in this life does not consist in the absence but in the mastery of his passions."