Copyrights are protected from any copying of the copyrighted materials without permission from the copyright owner. Unsure exactly what qualifies, go here . Although copyrights exist upon the act of creation, registration is offered by the Copyright Office to give owners some additional benefits. Click here to learn how to register a copyright. Fixation means that there must be a tangible medium of expression, so for example, a passing comment made by a well-known CEO is not eligible .
Originality requires that the work be new.
Note that this is not a subjective judgement of the quality of the work, just the factual assessment of whether its new or not. Lastly, minimal creativity is required. This is a little more subjective, but its not a high hurdle. Because of this, it is safe to assume, at the most general level, that any work you see on anyone's web site passes these tests. Also, the Berne Convention states that you don't need to post a copyright notice to obtain copyright protection, so the lack of a notice on your site or another has no impact.