We have 4 people in our stateroom. My name is the one on the credit card and my daughter is using her credit card for her expenses. So when I printed our setsail pass, there were 3 sheets; one for my husband & son without a signature, one for my daugher with her credit card info, and one for me with my credit card info. the only ones that needed signatures were my daughter's and mine. I'm assuming the signatures have to do with credit card but that is an assumption based on how the setsail printed out.
Have a great cruise!