Vulcan/packages/nova-settings/lib/server/publications.js

Meteor.publish('settings', function() {
  var options = {};
  var privateFields = {};

  // look at Settings.simpleSchema._schema to see which fields should be kept private
  _.each(Telescope.settings.collection.simpleSchema()._schema, (property, key) => {
    if (property.private) 
      privateFields[key] = false;
  });

  options = _.extend(options, {
    fields: privateFields
  });

  return Telescope.settings.collection.find({}, options);
});