[hayksaakian]

how do I even find that setting in a normal images search?

I don't see it under search tools...

[deefour]

"Usage Rights" at the bottom of this page: http://www.google.com/advanced_image_search

You get there by clicking the gear icon on the right side of the image search results page; 'Advanced search' is under that. Yay for Google making one more tool more difficult interact with.