Most commercial copy centers will not enlarge a copyrighted pattern. They feel it violates copyright. I had a pattern that *required* copying, because it was printed on both sides of the paper and cutting from one side would have destroyed the pieces on the other side. The copy center refused to do it.
(It is my personal opinion that once I buy a pattern, it is mine to do with as I will. I can enlarge it, reduce it, adapt it, sell or give it away when I'm done with it, or run it through the paper shredder! The only thing I cannot and will not do is make copies of it to sell or give away while I still retain the original.)