There is a WordPress Plugin available to put copyright information on your posts and pages automatically. It is called Creative Commons Configurator. Once you download and activate the Plugin you just do a few steps to set it up and then it will put a creative commons license on your posts/pages for you.
The page for setting it up is displayed below. It is very simple to do once you activate the Plugin. You decide whether you wish to share your post freely or not. There is the option about sharing the license internationally or more locally in a drop down menu. Once you have made those selections you use the license button.
At this point you can see that you are actually deciding to choose a license that will be attached to your post. It asks you whether you want to proceed. Continue reading WordPress Plugins: Creative Commons Configurator