I am not exactly sure what you mean with 'Adobe policy settings', however in case you are looking how Acrobat Pro tags PDF (so that they can be manipulated in 'free' Reader), this info is stored as a signature in 'Perms' dictionary.
You can access the info as follows:
Obj p = pdfdoc.GetRoot().FindObj("Perms");
if (p != null) {
// Check for the 'Rights' dict...
Obj rights = p.FindObj("UR");
...
// Maybe erase p.Erase("UR"); etc.
}