How can the node copy the bytes to display the post to users and to send it to other nodes, if obeying US copyright to a T, if the node does not either have cop

How can the node copy the bytes to display the post to users and to send it to other nodes, if obeying US copyright to a T, if the node does not either have copyrights over the content or the content is sufficiently licensed in a way that allows the node those privileges?