The Anti Theft Script is strictly related to the T-Frame Anti Thief widget and the Theft Protection section.
When you have this widget anywhere on your page and publish, a pixel will be placed on your published page to monitor it.
If someone copies the page and content and creates their own page, but they don’t remove this pixel and publish to another domain different from the original, you’ll be notified.
The report can be found in Manage > Theft Protections.
Just simply place the widget on the page. The point is to place it somewhere hard to be seen or with the highest chance not to be removed. Or it can also be placed multiple widgets on one page to increase the chance.
**However, please note that the more it is placed, the lower your page may perform.