Inside the loop, if you use the function the_date() to display the date the post was published, you may run into trouble. Specifically, if there are two posts published on the same day, the second one will return nothing for a date.
Technically, your work is protected under copyright “the moment it is created and fixed in a tangible form that it is perceptible either directly or with the aid of a machine or device.”  Registration of your copyrighted work is not required , but you should include a copyright notice on all published works .
Many footers on websites contain text like “© 2009 Your Website”. A good measure, surely. We can use some classic PHP and a built-in WordPress function to make this bit of text dynamic so that it will never need to be tampered with manually again. Here is the code to add to your theme template file (e.g.,