There was several copyright articles I read and they shared a couple of features.
The Getty images one I found interesting, because of how the took ownership of other peoples work. There is a difference between someone else’s copyright and your copyright. Someone else’s copyright you have to ask for permission to post or give away for every single item you are using, while a copyright of your ownership means you have control over your own items and can post or give them away whenever you want.
NFL one was intriguing too, because of how if you’re going to claim copyright you need too double check to make sure you are not violating any of your own rules. If you do violate any of your own rules you need to rewrite them or figure out how to stop people from copyrighting your stuff without you being able to stop them.