I shrug. Some things are legal in some places and not in others. For example, DPsycho, your profile lists you as being in America, which is probably the worst place in the world for this kind of thing, thanks to Big Media buying your government. I do advise that your laws do not apply everywhere, so don't assume they do just because America is big.
The Internet lies between everywhere, so the only laws Mojko needs to worry about are those which apply in his own locality, and any polices his hosting provider wants to hold him to over and above that. If he does indeed receive a C&D, the easiest response is simply to C&D, as 'requested'. But in the absence of such a demand, or some obscure fascist local regulation, he's under no obligation either to completely avoid using copyrighted material or even to credit sources.
This is mostly because the site is free. If he was charging money for it, it'd be a different story. Since he's not, it's fair use not only according to established international copyright standards, but even quite arguably under your own restrictive laws.