I don't think it should matter. Any images on the internet are ''public domain' unless it has a watermark or is 'Copyrighted'.
Wikipedia.com has a ton of 'public domain' images. You can also read more about copyrights etc. They have a vast amount of information there. I learned that from working with an app developer on facebook.
I had tons of pics of Criss on my old computer but the stupid thing just wimped out on me one day.
I did however manage to save many in my old photobucket account.
I tend to be 'over cautious'. Don't listen to me.