encryptor = function(data) {
        return data;
      }
(PDF 1.5) If set, a group of radio buttons within a radio button field that use the same value for the on state will turn on and off in unison; that is if one is checked, they are all checked. If clear, the buttons are mutually exclusive (the same behavior as HTML radio buttons).

@name AcroFormButton#radioIsUnison
@type {boolean}