In some cases you will indeed have to prepare a few documents before you can start an assignment.
Some guidelines include contracts or image rights authorization documents, which must be printed in several copies beforehand and signed during the assignment. This is a standard procedure..
If people are recognizable in the photos, they must sign an image rights authorization document.
If nothing is indicated in the guideline or in client comments, this means no document must be printed or signed.
This is why we insist that you read the guidelines carefully and adhere to them. By doing so, you will more easily avoid any litigious situations. When you are given the assignment, you must confirm that you have read these guidelines.