You can prevent your site visitors from downloading images and other content from your page ad protect your page content from being stolen by using the disable right click feature in WebStarts. 

To disable right click follow these steps.

Step 1. Select the page you would like to disable right clicking on in the page editor.

Step 2. Click File> Page Settings from the drop down menu.

Step 3. Check the box labeled "Disable Right Click" then click the "Apply" button.  

To use this feature you must have a WebStarts Pro Account. If you're using the free version you'll be prompted to upgrade to the pro version after clicking on the "Disable Right Click" checkbox.