Wiredwrx is correct.
Majority of people think that because you didn't inlcude copyright or license notice that it's ok to take it. Where in fact, like already stated, you orginal work is protected whether you say it is or not.
I've been a photographer for many years and I've never put any copyright info on my work but when I need to let someone know that they can't use them without my permission a simple e-mail usually worked.
Good luck
