When an application using the SDK retrieves document data, the Laserfiche server is able to record that as a read or view event. However, the Laserfiche server has no way of knowing what that application does with the document. So if the application sends that data outside its control, it is responsible for reporting the export event. In the simplest case, the code would look something like:

AuditEvent myAuditEvent = new AuditEvent(AuditEventType.ExportDocument, sess);
myAuditEvent.ReportAuditEvent(doc);

Note that there are additional properties where you can set page ranges, audit reasons, file formats, and watermarks, if any of that is relevant to you.