Copyright Laws

Here is a very detailed and informative piece explaining copyrights:
Copyright Explained: I May Copy It, Right? from Smashing Magazine.

From the legal point of view, Copyright in Web is often considered as the grey area; as such it’s often misunderstood and violated - mostly simply because bloggers don’t know, what laws they have to abide and what issues they have to consider. In fact, copyright myths are common, as well as numerous copyright debates in the Web.

Excerpt from Smashing Magazine