Ok this is not technically a tutorial it is more legislative I suppose but i thought i should ask you guys so let's see this is how it goes :

images what images are and are not allowed to be used because i can't necessarily write the photographer of some star and ask permission to use their photo for an lj icon but then if i use let's say someone's photo from deviantart then i am suppose to link back to their account? This is true even if i am not receiving money or credit for the icon? Or is this just proper edicate among users? I can understand that but some people are so totalitarian about this stuff. I am asking because I am getting ready to build a site and i wanna have all my cards in a pile.

thank you for your help

ps. does this also work with google image sites?