With blogging comes great responsibilty. You define the content of your weblog and you carry the full responsibility for every word you’ve published online. More than that, you are responsible for comments in your posts. To make sure you fulfill your legal obligations, it’s important to know, what you, as blogger, may or should do; and you have to know, how to achieve this. After all, the ignorance of the law does not make one exempt from compliance thereof.
This article explains copyright and how it applies to electronic material. Sure, it's focussed at bloggers, but anyone who is starting a career that involves publishing might be interested in this.