The EnableChecksum setting is used to determine whether a checksum is added to generated Application Server URLs.
If you are using the Unity Scheduler to send notifications that use the checksum feature in DocPop links, you must set the EnableChecksum setting to true. If set to true, you must also enter a checksum key value in the ChecksumKey setting, which is used to create the checksum value in the URL. When a user attempts to navigate to an Application Server URL, if the value does not match the ChecksumKey, the user is presented with an error. This is to prevent users from modifying query strings and accessing files they should not access.
When set to false, no checksum is created.