You could put watermarks all over the images so that they will have to contact you for a clean copy if they want to use them in an ad. 
--
Raina Accardi 
Saugerties, NY
RAgenealogy@...
Poland: GEVIRTZMAN in Kobylin; JESINOWITZ/YESNOWITZ in Mszczonów; FELSENSTEIN in Parysów.
Belarus: GUTTWOCH/GOODMAN and ZISSERMAN in Volchin; BUSHMITZ in Vysokaye.
Ukraine: TRAUB and JANOVSKY in Kolki, Sofievka, Radomysl, and Zhytomyr; WEISMAN or ROSENBERG.