I use several WordPress pages that are used in another CMS via IFrame. I basically needed to prevent users from opening the homepage or another page in a new window.
I just used the right click disable with message. Works beautifully. I measured the memory usage before and after activating this plug-in. There was only a .01MB memory increase.
To explain more in detail, I use the WordPress pages as a database for users to look up information. I don't care if they want to copy, print, or do whatever with the data. I just wanted to prevent users from opening a page in a new tab, window, etc.
I thank you for this plug-in. :)