Content copy is really an annoying thing even for successful bloggers. You may spent your precious time for writing a killer content. But it is easily copied by copy cats. Disabling right click won't entirely stop content theft even though it offer small protection from being stolen easily. Yet Digital Millennium Copyright Act (DMCA) is a better way to protecting your content. Anyway disable right click that will prevent copy cats from copying on the go.
A famous plugin having 30,000+ active installs. It has various feature level predominantly users cannot right-click, copy image and it denies user from using some computer hotkey such as CTRL+A, CTRL+C, CTRL+X,CTRL+S or CTRL+V. This plugin isn't completely free. Features vary depending on free and premium version. Though free version has enough features. In premium version, you can disable copy & paste restriction in specific pages (homepage or single post) for readers and admin users. It offers one level up protection drag and drop also restricted.
A free useful plugin that simply disable right click feature. When user try to right click it shows a jQuery dialog box with warning texts. You don't need to configure this plugin because it comes with pre-defined configuration. Just install it will do its work automatically. Though smart users still access page source through browser settings it prevents from non tech savvy.
Right Click Disable Orignal is a WordPress lightweight plugin offers protection from copy cats for this vandalism content and image theft. Tiny in size, it will not occupy much space on your web server.
Cannot completely stop copy and paste. If you disable right click on your WordPress site, tech savvy still access your content. Many modern browsers have hotkey for inspect element where by right is no need to copy a content. If you want to Protect your blog upload image with watermark and add copyright notice.