There may be a use case when App Admins need a way to set up permissions for a form based on the values entered on that form. 

That's why we've created document level permissions. Using the new conditional permissions, app admins can grant users access to a subset of documents in the document list based on user lookup or group lookup values. Users can be granted permission to documents within their department only, documents they have submitted, or documents that their name has been added to.*

*This is a preview feature: We want our customers to test it out and provide feedback as needed.

You can read more about the feature HERE.