If you are an Internal User (employee) you are required to have at least View rights to see the History of a document.  If you are an External user in a Cabinet, you must have at least Edit and Share rights to a document or item to View the History. 

If you are a user in a NetBinder, you must have Edit or Share to see the History of that NetBinder.  Individual documents contained in a NetBinder do not have their own History.  The History is logged at the NetBinder level.

When you make a copy of a document, a history is recorded in the original document and the new copy that refer to each other.

When you send a notification via the NetDocuments interface, it records who the notification was sent to.  If you are using the MAPI integration, a history record is recorded that you sent a notification via MAPI, but it does not record who it was sent to.  (You will generally have a copy of the email in your MAPI email system with that information).

When you make a change to a Profile, a history record is created.  The Profile attribute changed is noted in the history.

When you change the official version of a document, that is recorded in the document history.

When a document is deleted, it records that action in the History log.