dense0293, it is really difficult to protect content on the Internet, there is always a way to copy it. You can add a copyright notice to your website and a warning that you do not allow to copy it (it may stop some people), watermark your images, block the right click (though it's really not the best method because the right click is used not only to copy anything) and use a number of other techniques, but if someone wants to copy content from your website, he will do this.
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Cyberdasm, As Sunny has above it's a very difficult task to prevent your websites content from being copied and there are always a technique to copy a website's content. However i would like to extend on copyright notice and a popular method to check for online plagiarism. It's through Copyscape. Copyscape is an online tool used to detect online plagiarism on websites which has the same content you have on your website just by typing in your website. They have banners and articles on how to prevent and respond to online plagiarism.