Right. The redaction is to avoid giving them any information (no matter how seemingly useless) that I don't want to give them if they don't already have it (e.g

Right. The redaction is to avoid giving them any information (no matter how seemingly useless) that I don't want to give them if they don't already have it (e.g. eye color, weight, etc). The watermark is what (hopefully) limits the usefulness of the image, by stating when, who and why the image was furnished in a way that is relatively difficult to manipulate.