How to rename bookmarks

Question

I'm simply trying to rename a bookmark via javascript, and keep running into the notallowederror: security settings... Previously, when I ran into this problem, I could avoid it by certifying the document, which would allow the javascript to run as privileged.  However, renaming bookmarks is apparently quite a sinister activity, and needs extra security??  I made folder level scripts:
var renameBook = app.trustedFunction(
  function(thisPage)
    app.beginPriv();
    var books = this.bookmarkRoot.children;
    for (var i = 0; i < books.length; i++) {
      var vNotes;
      if (books[i].name == "Visit Notes") {
        vNotes = books[i].children;
        for (var j = 0; j < vNotes.length; j++) {
          if (vNotes[j].name == thisPage)
            vNotes[j].name = vNotes[j].name + "-signed: " + new Date();
    app.endPriv();
and call that from my document-level script, but I get the same problem...  what am I doing wrong?

Answer 1

Thanks for the response.  No, I'm not trying to use it in Reader.  I'm working exclusively in Acrobat.  But since you brought it up, what you're saying is that even if I got this working in Acrobat and saved it as Reader Enhanced, it wouldn't be able to change the name of the bookmark using Reader? 
When I use either the trusted function (in the folder level script) or try to change the bookmark name directly in my local scripts, I get:
NotAllowedError: Security settings prevent access to this property or method.
Preferences:
Javascript:
enable acrobat javascript "On"
enable menu items javascript execution privileges "On"
enable global object security policy "Off" (although I've tried it both ways)
Security (Enhanced):
enable enhanced security "Off" (tried it both ways)
I noticed that I could make it work correctly through a menuitem, but that I want this to be affected when I sign a digital signature.  Perhaps there's a workaround on this using the menuitem (perhaps make a hidden menuitem, and execute that? I'm not quite sure how to make that work, but maybe that's a possibility).  I'd prefer to make this work the way it seems like it's supposed to...  Thanks again.