If I shoot a single photo to a model, what does the relative MR imply? It's related only to that photo of that day, or it's related to all photo's that I should (or even not) shoot to that model? that is, if I ask a person to sign my MR, which are his/her risks ?

Hello to everyone, this is my first post. After lurking for some months I keep learning and now I'd like to join. Thanx for all your tips.