This policy setting prevents the Accessibility Checker from checking if a document has image watermarks.If you enable this ...

This policy setting prevents the Accessibility Checker from checking if a document has image watermarks.If you enable this policy setting, the Accessibility Checker will be prevented from checking if a document has image watermarks.If you disable or do not configure this policy setting, documents will be checked for watermarks and any issues will appear in the Accessibility Checker.