After a document is signed, the question is usually the same. Who opened it, who signed it, and when. That record has to live with the document, not in a log someone has to request later.
Open the audit trail on a document to see who viewed it, who signed it, and when. The trail is part of the document, so the history is one step away from the file itself.
The finished copy is part of that record. When signing is complete, the completed document is included, not only the list of events that led up to it. A reviewer can see the activity and the signed result together.
