As a travel magazine, I've had tremendous problems with image theft, not just from smaller sites but also from large corporations who should know better (and would enforce their copyright, were I to have stolen one of their images).
On a WordPress based site, a no right-click plugin doesn't prevent someone from clicking on the image and THEN stealing it. The only way that can be prevented is to remove the image links. As I have over 1000 images on my site, I wasn't relishing removing the link from every single image.
Not only does this plugin do what it says it will do, it does it w/o causing problems with the site and original articles/images.
Huge kudos to the developer(s) of this plugin! While this won't stop the truly tenacious image thief, it WILL keep a huge percentage of the population who truly believes, "If it's on the internet, it must be free). (If you'd like to see how well it works, visit my website, http://www.explorationtravelmagazine.com