Although they vary to some extent, you generally can't move with your kids across a state line without the express written consent of the other parent or a court order. (info.legalzoom.com)
Under Model Rule 4.2, you are prohibited from communicating with represented parties without consent of the other lawyer or by court order. (lawyerist.com)
Neither party shall assign this Agreement in whole or in part without the prior written consent of the other party. (myimprov.com)