If you want to prevent unauthorized copies of parts of your Internet sites you should have a look at HTML Guard.

Among other features this software lets you encrypt your HTML source code and disable the right mouse button, text selection and the print function within a browser. Put an end to copying and modification of your HTML code, images and text by others thus protecting your copyright.

While not offering absolute security, the combination of several tricks creates protection that certainly adds a great level of difficulty to circumvention. Once secured by HTML Guard, the files retain their original appearance and pages can be viewed in any common JavaScript enabled browser.