An objective piece of data like what? A digital photo? A network traffic log? A printed photograph? A phone call recording? These are _all_ based on someon

An objective piece of data like what? A digital photo? A network traffic log? A printed photograph? A phone call recording? These are _all_ based on someone's word, in a world of Photoshop, text editors, hex editors, scanners and printers, voice synthesis, etc.